Why do people say this? Surely everyone knows this already? I hear it from enough people that it must be common knowledge. Even DD6 admonishes me for including tomato on a list of vegetables. But why do I never hear "a pepper is actually a fruit", "a squash is actually a fruit" "an aubergine is actually a fruit"? Do people just parrot the tomato fact without considering the presence of seeds and that maybe they know many other vegetables that are technically fruits as well, and that it doesn't matter?