Mayo, mustard, and yer choice of either sweet or dill relish. (I use a homemade sweet relish my mom jars everyyear.) How much is to taste, you can tell when its too much mayo or mustard. After mixed and spooned in, I sprinkle ( light cover) with paprika. Finely diced onion mixed in is optional. Sometimes I green olive/ black olive in the middle of them. Thats optional. Pretty simple, nothing special I do, but I have tried outrageous crap in it...experimenting. Hot stuff, which worked for me but noone else. A sweet red pepper slice or green pepper slice. Those go well too but the regular ole mix, up top is the fast ones to go.