When I was growing up, my parents had only one rule about trying foods. We didn't have to try anything, not even one taste, if we didn't want to (not that we would be given something else special, we just had to make do with the other things on the table). There was only one exception: if you said "Yuck!" or anything else disparaging about something that was being served, you had to eat a whole, good sized portion of it. No appeal, either, because it was your own fault -- you wouldn't have even have had to have one bite if you'd been polite.
My big brother broke the rule (blueberry pie) and got that consequence exactly once. I witnessed it, so I never did.
My husband and I had the Yuck Rule with our kids, too, and I don't think either of them ever broke it, and they are glad they learned the rule about not disparaging what others are eating (not to mention insulting the cook/host). Neither is or was a picky eater. When we last discussed this, some posters said that they felt it was wrong to force the child to eat the portion of the food they'd yucked, and some to not insisting on trying a bite, but neither seemed to lead to any eating disorders or pickiness in our family. My brother still won't eat blueberry pie, but he doesn't like blueberries anyway, so I don't think it's that he is still traumatized more than 50 years later.
Children love to cheer, "Yuck to [chocolate cake, e.g.]!" to their favorite foods to "have to" eat it. They all think they came up with it on their own.