Botany and origin of the cashew tree
In the cerrado and restinga of northeastern Brazil grows an oddity: a colorful pear-shaped fruit, red or yellow, soft and juicy, and hanging below it, sticking out like a thumb, a gray-green kidney-shaped seed. That's the cashew. The nut grows outside the fruit, not inside. Botanically it's a drupe: the seed is the real fruit, and the colorful "fruit" above it is actually a swollen flower stem called the "cashew apple." No other nut on earth does this.
The Tupi tribes of Brazil knew this tree thousands of years before any European set foot on the coast. They called it acajú, "the nut that makes itself." They ate the apple, drank its juice, fermented it into drinks, and used the bark and leaves medicinally. The nut itself they knew to roast over fire to neutralize the toxic liquid in the shell.
In 1557, the French monk and naturalist André Thévet became the first to document the cashew in writing: a common wild plant in Brazil, whose fruit and roasted kernel the natives ate. But it was the Portuguese, who had colonized Brazil, who turned the cashew from a local plant into a global commodity. They were already exporting by the 1550s, and between 1560 and 1565 they brought the tree to Goa, their colony in India.
The English word "cashew" comes from a mishearing. The English pirate-naturalist William Dampier heard the Portuguese saying "caju," a Tupi word meaning "the nut that makes itself," and wrote down "cashew." The error stuck.
From Goa, the cashew moved on to Mozambique and East Africa, and from there to Southeast Asia. Monkeys helped spread it across Asia. Spanish galleons sailing from Latin America to the Philippines may have brought cashew directly from the New World, bypassing India altogether. Four hundred sixty-eight years of trade, from a wild plant of Brazilian shamans to the most-sold nut in the world.
Today, the largest cashew tree in the world stands in Pirangi, Brazil. A genetic mutation causes its branches to touch the ground and take root. The result: a single tree covering 8,500 square meters, larger than a soccer field. Its name: Maior Cajueiro do Mundo.
Growing regions: Vietnam, India, and Africa
The most important fact in the cashew industry is the gap: the countries that grow cashew are mostly not the ones that process it. Ivory Coast is the world's largest grower, 1.04 million raw tons in 2024, roughly 27% of global production. But most of its nuts ship raw to Vietnam and India for processing. Only 10% of African nuts get processed in-country.
Vietnam is the central story. With domestic production of only 320,000 tons, it imports millions of raw tons from Africa and Cambodia, processes them, and exports 765,000 tons of kernels, controlling more than 80% of global kernel exports. In 2024, Vietnamese cashew exports hit 4.6 billion dollars.
Brazil, the cashew's homeland, is no longer a major player at only 135,000 tons. But it leads in one thing: 90% of cashew apples are consumed in Brazil, as juice, sweets, and "cajuína." In the rest of the world, the apple is thrown away.
| Country | Production (tons) | Role | Trend |
|---|---|---|---|
| Ivory Coast | 1,040,000 | Grower #1 | ↑ Building processing |
| India | 782,000 | Grower + processor | ↑ Rising domestic demand |
| Vietnam | 320K prod. + 765K export | Processor #1 | → Automating |
| Tanzania | 425,000 | Grower | ↑↑ Hitting records |
| Cambodia | ~500,000 | Grower + raw export | ↑↑ Growing |
| Benin | 220,000 | Grower | ↑ Raw-export ban 2025 |
| Brazil | 135,000 | Grower (homeland) | → Stable |
Biochemistry, oils, and the CNSL story
Cashew is the only nut you can't eat raw straight off the tree. The shell contains a toxic liquid called CNSL, Cashew Nut Shell Liquid, made up of anacardic acid, cardol, and cardanol. These compounds are chemically close to urushiol, the toxin in poison ivy. Contact with the liquid causes burns, blisters, and severe skin reactions. That's why you'll never see cashew in the shell, unlike pistachio, almond, or walnut.
In India and West Africa, hundreds of thousands of workers, most of them women, cracked cashews with bare hands for decades. The CNSL burns the skin, causes permanent scarring, and long-term damage. The shift to machine cracking is ongoing but far from complete.
What "raw cashews" in the store actually means
When you see "raw cashew" in a store, it isn't truly raw. It's been heat-treated to neutralize the CNSL and make it safe to eat. "Raw" in cashew terms means it hasn't been further roasted after basic processing. There's no such thing as a cashew that hasn't been heat-treated and is safe to eat.
The CNSL itself is an important industrial product. It's a source of plant-based phenols, raw material for resins, coatings, brake linings, insulation, and adhesives. What used to be hazardous waste turned into a separate revenue stream.
Nutrition and the cashew's mineral profile
Cashew is one of the most nutritionally balanced nuts. Unlike macadamia (76% fat) or pecan (72% fat), cashew contains "only" 44% fat, the lowest of any tree nut. Most of that fat is monounsaturated, oleic acid, the same as olive oil. That's what gives it the creamy, mild flavor that sets it apart.
| Nutrient | Per 100g | % DV | Note |
|---|---|---|---|
| Calories | 553 kcal | 28% | Lower than pecan, macadamia, walnut |
| Total fat | 43.9g | 56% | Lowest among tree nuts |
| Saturated fat | 7.8g | 39% | |
| Monounsaturated fat | 23.8g | Like olive oil | |
| Protein | 18.2g | 36% | #3 after almond and pistachio |
| Carbs | 30.2g | 11% | Relatively high, explains the creaminess |
| Fiber | 3.3g | 12% | Relatively low |
| Magnesium | 292mg | 73% | Among the highest in food |
| Copper | 2.2mg | 244% | Leading source |
| Zinc | 5.8mg | 53% | Important for immune function |
| Iron | 6.7mg | 37% | High for a nut |
| Phosphorus | 593mg | 84% | |
| Manganese | 1.66mg | 72% |
Low fat + high starch. Cashew contains about 30% carbs, much of which is starch. That's what gives it the smooth, creamy texture when ground. It's the reason cashew butter is smoother than almond butter, and why many plant-based "cheeses" are built on cashew.
Grades W180 through W450: what the W means
Cashew is graded on an international system built around one number: how many whole kernels fit in a pound (454g). W320, the most common grade in the world, means 300-320 whole white kernels per pound. The lower the number, the bigger the kernel, the higher the price. India runs 33 grade classifications, of which 26 are in commercial use.
| Grade | Kernels / lb | Size (mm) | Nickname | Target market |
|---|---|---|---|---|
| W180 | 170-180 | 22-26 | King of Cashews | Middle East, Japan, gifts |
| W210 | 200-210 | 20-23 | Premium Large | USA, Middle East |
| W240 | 220-240 | 18-21 | Large | USA, Europe |
| W320 | 300-320 | 15-18 | Standard | Global |
| W450 | 400-450 | 12-15 | Small Whole | Europe, industry |
Beyond the whole grades, there's a broken system: Butts (lateral halves), Splits (length halves), LWP (Large White Pieces), SWP (Small White Pieces), BB (Baby Bits). And color classifications: White (premium), Scorched (lightly burned, lower price), Dessert (dark, industrial).
In February 2025, average Vietnamese export price hit $6,821 a ton, a 28% rise year-on-year. W180 in the Middle East can run double the price of W450 in Europe. W320 is the analytical truth of the market: every other grade prices relative to it.
Target markets by grade: the U.S. favors W210, W240, W320. Europe buys W320 and W450. The Middle East goes for W180 and W210. Vietnam exports mostly W320, W240, and W180, which together make up 63.5% of export volume and 70% of value.
Six to eight kernels cover a palm. Considered premium and aimed mainly at luxury markets: Middle East, Japan, gifts. Prices run 20-30% above W320. Vietnam and select Indian growers specialize in it for domestic and premium export.
The most common grade in export. Mid-sized kernel, ivory-white, whole. Vietnam exports more of this than anything else, roughly 40% of total W-grade export volume. Fits retail, snacks, and any use that needs a whole impressive kernel without going huge.
Same kernel, broken during the cracking process. Flavor is identical. Used for cooking, baking, granola, ice cream, muesli, chocolate coatings. The smart buy for cooking. There's no reason to pay a premium for whole kernels when the product is going to be cut up anyway.
Cashew kernels that had their testa removed while still fresh, before full drying. Color runs light-green to ivory. Flavor is more delicate and fresher than a standard dried kernel. Used in premium pastry, chocolate, gelato. Prices 20-40% above comparable W320.
Beyond the snack: where cashew is going
Cashew is the most versatile nut in the trade. In Israel it's mostly seen as a premium snack, raw or roasted, salted or not. But the real shift over the last two decades is from snack to ingredient. The creamy texture, relatively neutral flavor, and high starch content turned it into the base of an entire industry.
Roasted and seasoned snack
Cashew roasted and salted, with honey, wasabi, garlic, chili. The Asian market leads on flavors, Europe and the U.S. on volume. Three things work: the flavor is mild enough not to be steamrolled by seasoning, the texture is crunchy without being hard, and the kernel size is uniform and impressive.
Cashew milk and cashew cream
This is the nut that built the vegan industry. Grind cashew with water and you get a creamy, milky liquid that's the base for plant milk, cooking cream, "cheese" macaroni, sauces, and pastry fillings. The reason: cashew doesn't need straining (unlike almond), gives a smooth texture without grit, and the flavor is neutral enough to take any seasoning.
The world's kitchens
In India, cashew is the base for sauces (korma, masala). In Thailand and China, stir-fried with chicken and vegetables. In Brazil, cashew-apple juice (cajuína) is a regional national drink. In Goa and Portugal, "Feni," an alcoholic spirit distilled from fermented cashew apple, is among the strongest in the world.
The shell oil (CNSL): coatings, resins, brake linings, insulation. The cashew wood: charcoal, light construction, boats. The bark: yellow dye. The leaves: traditional medicine. Even the testa peeled from the kernel finds a use in the cosmetics industry.
The tree itself: how cashew actually grows
The cashew tree (Anacardium occidentale) belongs to the Anacardiaceae family, the same family as pistachio, mango, and poison sumac. A tropical evergreen that can reach 14 meters, though the commercial dwarf cultivars top out at 6 meters, mature faster, and yield more. The tree needs a tropical climate with a defined dry season, 1,000-2,000mm rainfall, and well-drained soil.
The flowers are small, star-shaped, and insect-pollinated. Each tree carries a mix of male and bisexual flowers. Native bees of the Centris genus pollinate more efficiently than regular honeybees. A study in northeastern Brazil showed the native pollinator outperforms the imported honeybee.
When a bisexual flower is fertilized, the seed develops first, the kidney-shaped drupe. Only after that does the flower's pedicel swell up and create the "cashew apple." This is the opposite of every other fruit, where the fruit develops around the seed. With cashew, the seed grows first, and the fruit develops after it and above it.
This anomaly confused even famous painters. Maria Sibylla Merian, the celebrated nature illustrator of the 17th century, painted cashew in Suriname with the fruit attached directly to the branch, with no apple. She simply didn't understand the structure.
A mature tree starts producing after 3-5 years and hits full production after 7-10 years. A modern dwarf tree yields 15-25 kg of in-shell nuts a year. The edible portion, the kernel, is only 20-25% of the in-shell weight. So every raw ton yields 200-250 kg of kernels. That's why cashew is expensive.
The cashew apple, discarded in the rest of the world, is a fruit rich in vitamin C, more than five times that of an orange. It carries high sugar, makes juice (cajuína), wine, and fermented drinks. The challenge: shelf life is extremely short, three to five days, which makes export nearly impossible.
Quality standards, moisture, and aflatoxin risk
Processed cashew needs to reach 3-4% moisture, far lower than most nuts. Above 5% moisture, mold and aflatoxin risk start to rise. Signs of spoiled cashew: unusual oiliness, musty smell, bitter taste. Don't eat. Throw out.
Raw cashew nuts (RCN) are measured by Outturn, how many pounds of kernel come out of an 80kg raw bag. Standard: 48-52 lbs / 80kg bag. Maximum moisture: 10%. Above that, mold risk rises, outturn drops, and price falls.
| Storage | Duration | Conditions |
|---|---|---|
| Room temperature | 2-3 months | Sealed packaging, away from odors |
| Refrigerator | Up to 6 months | Sealed packaging, away from strong odors |
| Freezer | Up to one year | Ziploc bag, can be eaten straight from frozen |
Roasted cashew spoils faster than "raw" because roasting accelerates fat oxidation.
Allergens
Cashew belongs to the tree nut group from an allergen standpoint. In the U.S., it's one of the eight allergens required on labels. Cashew allergy can cause severe anaphylactic reactions. There's cross-reactivity with pistachio, both belonging to the Anacardiaceae family. Anyone allergic to cashew should also be tested for pistachio, and vice versa.
Cross-sensitivity is also possible with mango (same botanical family) and with poison ivy, where the link is chemical (urushiol). Important note: the processed kernel itself contains no CNSL, but trace amounts can remain on kernels that were processed insufficiently.
Children with tree-nut allergies: medical consultation before any first exposure. "May contain tree nuts" labeling should be taken seriously. Tree-nut allergy rates continue to rise.
The buyer's guide
The cashew is an anomaly. A nut that grows outside its fruit. A seed that has to have its own poison neutralized before you can eat it. A product whose homeland barely exports it anymore. An industry that built itself for years on dangerous hand labor by women, and only now is moving to automation. A supply chain in which one country grows, another processes, and a third consumes, and all three depend on each other.
From 1557, when André Thévet first documented it, to 2025: 468 years of trade. From Brazil to Goa, from Goa to Vietnam, from Vietnam to every supermarket in the world. The nut that Brazilian natives called acajú, the nut that makes itself, now produces a market worth nearly 10 billion dollars.
When you eat a cashew, you're eating the seed of a tropical tree that went through heating, cracking, drying, peeling, sorting, and packaging, most likely in Vietnam, from a raw nut grown in Africa, on a tree whose origin is in Brazil. That journey, from the Amazon to the plate, is one of the longest in the food world.
How to buy
W320 is the standard, the best price-value ratio. W240 for premium. Pieces (Splits / LWP): same flavor, 30-40% lower price, the better choice for cooking and baking.
Check: light ivory color (old equals dark yellow), creamy pleasant smell, crisp texture (limp equals moisture). For roasted and salted cashew, check the production date. The oil oxidizes fast.
How to store
Sealed packaging, refrigerator up to 6 months, freezer up to a year. Away from strong odors. Cashew absorbs odors.
How to use
As a snack, in Indian cooking (sauce base), stir-fried, ground for butter, soaked in water and ground for vegan cream. And no, you don't need to soak before eating. It's been through more than you thought.
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