Acid. Tomatoes are acid. That’s why when you cook with tomato juice and tomatoes, is better to sprinkle some sugar (very little) in the pasta sauce you’re preparing. This is a way to soften the tomatoes acid and to make the “result” really tasty.
And speaking of devil (tomatoes), if you eat them raw and want to be impressed by them, add some lemon juice. You’ll like the flavor a lot, cause the lemon’s acid will boost tomatoes’. At least this is what I’ve experienced today, during my frugal, simple and T.A.S.T.Y breakfast.