I have the same rule at our house...
you must try one taste, then if you do not like it, you may fix something else for yourself for dinner. It works pretty well. Lots of times I will hear, "mmmmm, that tastes pretty good" and other times "yuck!". I used to serve egg salad sandwiches, until I discovered how much better everyone loved deviled egg sandwiches. (smile) It works for me.