It definitely happens. In my last job -- fine dining restaurant with Greek overtones -- walnuts were big. At the time I didn't mind them, but after reworking the baklava and then working up a walnut cake dessert, I can't stand walnuts anymore. And they make my mouth itch. In fact, stone fruits make my mouth itch too, but they're a staple during the summer. In general I don't feel good about making or sending out a dessert without tasting components first. Notice I used the word *taste* -- and in the case where I don't like the item or am allergic, I take as little as I can get away with . I'll also ask someone who's palette I trust to back me up. Also, the food business is a service industry, so sometimes you gotta suck it up and serve people what they want, if it's doable ("table 3 wants the cake, sorbet, sauce, and garnish all on separate plates"). It was a lesson hard-learned for me but it was also interesting to learn how happy and appreciative customers can be when they get what they want.