Tomato

The “Poison Apple” That Took Europe 200 Years to Eat — and Ended Up Before the US Supreme Court

The tomato’s wild ancestor, a small currant-sized fruit related to Solanum pimpinellifolium, originated in the Andean region of what is now Peru, Ecuador and Chile. Domestication happened further north: by around 500 BCE, Mesoamerican farmers in southern Mexico were cultivating tomatoes, and the Aztecs bred multiple distinct types — Nahuatl texts describe “large tomatoes, small tomatoes, leaf tomatoes… those which are yellow, very yellow, quite yellow, red, very red” — under the name tomatl, the root of the word used across most of the world’s languages today. Spanish conquistadors encountered it in Aztec markets after Hernán Cortés’s 1521 capture of Tenochtitlan, and the Columbian Exchange carried tomato seed to Europe within a couple of decades; the first European literary mention appears in Pietro Andrea Mattioli’s 1544 herbal, which classified it — correctly, taxonomically, but with unfortunate consequences — alongside the nightshade family.

That classification cost the tomato roughly two centuries of goodwill. English herbalist John Gerard’s widely circulated 1597 Herball described the plant as having a “rank and stinking savour” and helped cement a European belief that it was poisonous, a suspicion reinforced by its visual resemblance to deadly nightshade berries. (A popular modern explanation blames aristocratic pewter tableware — claiming tomato acid leached lead from the plates — but food historians and chemists have pushed back on this as an implausible retrofit rather than a documented cause; the simpler explanation is that herbalists distrusted anything that looked like belladonna.) For generations the tomato was grown mainly as a curiosity or an ornamental in Northern Europe, while Italy — where it had arrived by the 1540s — moved far more slowly toward eating it too: the plant wasn’t meaningfully worked into Neapolitan cooking until the late 1600s, with the first published tomato recipes appearing in a Naples cookbook in 1692. American acceptance lagged even further, with lingering “poison apple” folklore persisting into the early 1800s before newspaper recipes and, eventually, Joseph Campbell’s condensed tomato soup helped normalize it commercially.

The tomato’s strangest legal chapter came later, in the United States. Botanically, a tomato is a fruit — the ripened ovary of a flowering plant. But the 1883 Tariff Act taxed imported vegetables while exempting fruit, and in the 1893 case Nix v. Hedden the US Supreme Court ruled unanimously that, for tariff purposes, tomatoes counted as vegetables because they were eaten as part of a meal course rather than as dessert — a decision about customs duties, not botany, that still gets misquoted as science more than a century later.

In the Professional Kitchen

Fresh tomatoes remain essential wherever raw texture, juice and acidity matter — salads, salsas, bruschetta, gazpacho — but professional kitchens rely just as heavily on processed forms for consistency and cost control. Canned whole peeled tomatoes anchor Italian and Mexican sauce work because they hold shape and can be crushed to order; crushed and diced canned tomatoes save that step for high-volume sauce and stew production. Purée and passata (strained, uncooked purée) give a smoother base with less cook-down time than starting from fresh, while tomato paste — concentrated to roughly 28–32° Brix — is used in small quantities to deepen color, umami and body in braises, soups and sauces without adding excess liquid. Sun-dried tomatoes, whether oil-packed or dry-packed, bring concentrated sweetness and chew to salads, spreads and garnishes. Tomato powder is increasingly used in spice blends, dry rubs and modernist applications where zero added moisture matters.

Tomatoes define entire cuisines rather than functioning as a background note: Italian cooking (sauces, pizza, caprese), Mexican cooking (salsas, moles), Indian curries, Middle Eastern stews, Spanish gazpacho, and the American burger-and-ketchup tradition all treat tomato as a structural ingredient, not a garnish. One handling point matters across all of them: tomatoes’ acidity reacts with uncoated aluminum and reactive cast iron, producing metallic off-flavors and discoloration, so long simmers should stay in stainless steel, enameled, or non-reactive cookware.

Varieties & Forms

Cultivar choice matters as much as ripeness. Plum-type tomatoes (Roma, and the DOP-protected San Marzano grown on Vesuvius’s volcanic plain south of Naples since at least the 18th century) have thick flesh, few seeds and low water content, making them the standard for sauces and canning — San Marzano’s low acidity and high potassium/phosphorus soil profile is specifically why Neapolitan pizzerias treat it as a named, protected ingredient rather than a generic can of tomatoes. Beefsteak varieties are large, juicy and best for slicing — burgers, sandwiches, caprese. Cherry and grape tomatoes offer concentrated sweetness and hold up well roasted whole or used raw in salads. Heirloom varieties trade shelf life and disease resistance for flavor complexity and color range, commanding a premium that should be costed and menu-priced deliberately, not treated as a drop-in replacement for commodity round tomatoes. On-the-vine tomatoes are marketed on freshness perception and command a price premium that isn’t always matched by flavor difference once off the vine.

On processed forms: reach for canned whole peeled or San Marzano DOP when the dish showcases the sauce itself; use crushed or diced for volume production where speed matters more than texture control; use paste when you need concentrated flavor and color without added water (rehydrating paste is cheaper per unit of tomato solids than reducing fresh purée from scratch); use sun-dried for intensity in small doses rather than as a fresh-tomato substitute — its flavor profile is fundamentally different, not just more concentrated. Never treat canned and fresh as interchangeable by weight in a recipe spec: canned product already accounts for skin, core and juice loss that fresh prep has to absorb as labor and yield shrinkage.

Why It Matters for Your Food Cost

Tomatoes are genuinely volatile, and the volatility comes from several independent directions at once. California grows roughly a third of the world’s processing tomatoes and about 95% of the US processed crop, so drought hits global paste and sauce pricing hard: the 2022 drought cut the state’s forecast harvest by around 10%, and processor input costs rose an estimated 25% that summer alone, feeding through to reported price increases of roughly 17% on canned tomatoes, paste, ketchup and pasta sauce over the following year. Weather shocks elsewhere move fresh-market prices just as fast — a January 2023 cold snap in Morocco and Spain, the UK’s main winter tomato suppliers, cut Almería-region volumes by around 22% year-on-year and pushed major UK supermarkets into purchase-limit rationing on tomatoes, with retail prices up roughly 40% from three years earlier. On the disease side, tomato brown rugose fruit virus (ToBRFV), first identified in Israel in 2014, has now spread to production regions across Europe, the Middle East, Asia and the Americas, causing yield losses reported as high as 70% on affected crops with no cure available once a greenhouse is infected.

Trade policy adds a further layer specific to North American kitchens: the US formally withdrew from the 2019 US–Mexico Tomato Suspension Agreement in July 2025 and imposed a roughly 17% antidumping duty on Mexican fresh tomatoes — a meaningful cost shift given Mexico supplies a large share of US fresh tomato imports and its own government has said there is “no substitute” market. Separately, global tomato paste supply chains carry sourcing risk: Xinjiang, China accounts for a meaningful share of world tomato paste production, and the US has banned Xinjiang-origin tomato products since 2021 over forced-labor concerns, with investigations finding the product still reaching supply chains through intermediaries — worth verifying with any low-cost bulk paste supplier.

On allergen status: tomato is not one of the major allergens under EU or US mandatory labeling schemes, but it is a well-documented trigger for oral allergy syndrome (pollen-food syndrome) via the profilin protein Sola l 1, which is heat-labile — meaning guests who react to raw tomato may tolerate cooked sauce without issue. A separate tomato protein, the lipid transfer protein Sola l 3, is associated with more significant reactions and does not break down with cooking, so “cooked is always safe” isn’t a rule to state unconditionally on a guest-facing allergen matrix. On storage: ripe fresh tomatoes held below about 12–13°C lose flavor compounds and develop mealy texture (chilling injury), so refrigerating tomatoes to extend shelf life trades spoilage risk for flavor loss — a tradeoff worth setting deliberately rather than defaulting cold storage for every SKU.

How CalcMenu Helps

• Recipe costing pulls live supplier prices so a sauce, salsa or pizza base reflects this week’s paste and fresh-tomato market rather than a rate entered before the last drought or tariff shift.
• Substitution costing lets you model canned-versus-fresh, or commodity-versus-heirloom, side by side on cost-per-portion before a supply shock forces the decision under pressure.
• Allergen tracking can flag tomato’s oral allergy syndrome profile on guest-facing matrices, distinguishing raw-only triggers from heat-stable ones rather than treating tomato as a blanket safe or unsafe ingredient.
• Multi-site price consistency surfaces when one location is paying materially more per case for the same grade and pack size, giving procurement a concrete renegotiation trigger during a volatile market.

Sources

• Tomato - Wikipedia
• How the Misrepresentation of Tomatoes as Stinking ‘Poison Apples’… - Smithsonian Magazine
• San Marzano tomato - Wikipedia
• Rotten Tomatoes: Implications of the Termination of the U.S.-Mexico Tomato Suspension Agreement - CSIS
• U.S. imposes 17% tariff on Mexican tomatoes after withdrawing from agreement - Texas Public Radio
• California drought slashes tomato crop, driving up prices - Axios, Oct 2022
• California’s tomato farmers are getting squeezed by water crisis - CNN, Oct 2022
• Tomato shortage hits supermarkets after poor weather across Europe and Africa - The Retail Bulletin, Feb 2023
• Tomato brown rugose fruit virus: An emerging and rapidly spreading plant RNA virus that threatens tomato production worldwide - PMC
• USA bans all cotton products and tomatoes from Xinjiang over forced labour concerns - Business & Human Rights Resource Centre
• The U.S. Banned Xinjiang Tomatoes Over Forced Labor Fears. Amazon And Walmart Still Sell Them - Forbes, Feb 2024
• Tomato Allergy and the ‘Nightshade’ Question - Allergy Clinic UK
• Tomato allergy - Altmeyers Encyclopedia, Department of Allergology