I'm fairly fussy about food, but only due to food allergies. However, the best way to ensure you receive food how you want it is to provide them with the reason you want it a certain way. If I order a salad that normally has almonds, I specify I want it without, as I am deathly allergic to almonds, and normally, they're pretty good about serving it that way. If not, it gives you a valid reason to send it back. The other option is to ask to speak directly to the chef or manager concerning your order.