Can you train yourself to like certain foods?

Well, a former health teacher once said that she replaced white bread with whole wheat bread in her diet at some point in her life. Whole wheat bread usually tastes different than white bread, but after a while, she found it that whole wheat bread started to taste about similar to white bread. Take that as some sort of proof that the way you taste and think about a food changes over time. I say "Yes", you really can train your taste buds.

Also, onions are great. Totally agreeing with Rob.