Probably because American sandwich food chains insist on using the lowest quality, absolutely bland pink tomatoes, which are slimy and disgusting after having b

Probably because American sandwich food chains insist on using the lowest quality, absolutely bland pink tomatoes, which are slimy and disgusting after having been in contact with a patty on one side and presumably some condiment/bun on the other. Compare that to a fresh, sweet, homegrown tomato off the vine, still warm from the summer heat.