That's normal and customers are being customers. They just want to taste your own product because its new to them. I work in a restaurant all day, I probably get about 10 to 20 tasters for customers. Some of them even asks for alfredo sauce tasters or clam chowder tasters. Also, you dont need to cook a whole dish to cook a sauce, you obviously have a sauce on a side that you put after cooking the proein. If you think about it, yes tasters will cost quite a bit in the long run but if customers liked it then, they will order it and come back for more. But if they dont like it then they'll tell you what to improve on. You cant be annoyed, lazy or say that its difficult to make a sample sauce or soup, you gotta remember that you work in a restaurant and you pre much serve people.
