The very identity of the tomato is and has for a long time been a point of contention. On the one hand, botanical purists point out that the tomato should be considered a fruit, given that it is the fruit of a vine. On the other hand, as part of our diets, the tomato “acts” like a vegetable.
Over a century ago, no less than the U.S. Supreme Court took up the subject, ruling in a short opinion that the tomato should be treated as a vegetable. The issue arose over a protest mounted in court by importers of tomatoes from the West Indies against a tariff that had been imposed on the tomatoes. The tariff could be imposed on vegetables but not on fruits.
The Supreme Court case boiled down to competing experts for both sides, as well as competing dictionary definitions. In the end, since the terms “vegetable” and “fruit” were found not to have any specialized meanings in the context of trade and commerce, the Court decided to treat tomatoes as most people did at the time when they ate them, that is, as vegetables.
In short, the Court determined that whichever way the tomato may have been characterized by botanists, it usually was used and treated as part of the meal itself (or “repast,” in the Court’s words) and not, like most fruits, as a dessert. Thus, the plaintiff importers could not avoid the challenged tariff.