Tomato

A New World fruit

Tomatoes are native to western South America. They moved north through Mexico (where the Aztecs cultivated and ate them — tomatl) before Spanish ships carried them to Europe in the 16th century. Italian cooks didn’t widely accept the tomato until the 18th century — when they did, it transformed Mediterranean cooking permanently. Pasta sauce, pizza, and gazpacho all postdate the tomato’s European arrival by centuries.

Botanically a fruit, legally a vegetable

The 1893 U.S. Supreme Court case Nix v. Hedden ruled that tomatoes are vegetables for tariff purposes — a legal classification, not a botanical one. Botanically, a tomato is a berry (a fleshy fruit with seeds embedded in pulp, formed from a single ovary).

Why supermarket tomatoes are bad

A perfect summer tomato, ripe on the vine, is a different food from the average grocery-store tomato. Several reasons:

• Commercial tomatoes are bred for shipping durability and uniform color, often at the cost of flavor.
• They’re picked green (mature green) and ripened with ethylene gas in trucks. Vine-ripening produces sugars, acid, and aromatic compounds that ethylene-gassing can’t replicate.
• Refrigeration below ~10 °C destroys the texture (the cells burst when frozen-ish) and stops flavor compounds from developing.

The 21st-century renaissance of heirloom tomatoes is largely a reaction against decades of bland, uniform supermarket fruit.

Umami in disguise

Tomatoes are unusually high in glutamic acid — the same amino acid that gives Parmigiano, soy sauce, and dashi their savory umami. This is why a small amount of tomato (paste, ketchup, or sauce) deepens the flavor of meat dishes that don’t otherwise taste “tomato-y.”

Sun-dried, canned, and paste

Concentration intensifies flavor:

• Canned San Marzano — the gold standard of canning; tinned within a day of harvest.
• Tomato paste — cooked down to a sticky concentrate; one tablespoon equals roughly four fresh tomatoes’ flavor.
• Sun-dried — moisture removed in the sun, leaving a chewy, intensely sweet morsel.