Watermelon

A watermelon is about 92% water and is botanically a berry, and some are grown square on purpose.
Sandwich

The sandwich is named after the 4th Earl of Sandwich, who was named after a town that has no sandwich.
Ketchup

In the 1830s tomato ketchup was sold as a medicine, in pill form, for indigestion.
Chocolate

Cacao beans were once used as money in Mesoamerica, so chocolate literally grew on trees.
Apple

Apples float because about a quarter of an apple is air, which is why nobody bobs for potatoes.
Tomato

Botanically a tomato is a fruit, but in 1893 the US Supreme Court ruled it a vegetable.
Potato

In 1995 the potato became the first vegetable ever grown in space.
Pineapple

A pineapple takes up to two years to grow, and it contains an enzyme that gently digests you back.
Peanut

The peanut is not a nut; it is a legume whose flowers bury themselves underground to grow the pods.
Carrot

Carrots were originally purple or yellow; orange carrots became common in the Netherlands in the 1600s.