Fillings (vary by piece):
Mozzarella (Milk, salt, rennet, cultures)
Meat (beef/pork for olives ascolane)
Vegetables (e.g. olives, potatoes)
Cheese and/or béchamel (Milk, butter, flour)
Coating:
Wheat flour (Gluten)
Water
Breadcrumbs (wheat flour, yeast, salt)
Starch (wheat or potato)
Other ingredients:
Sunflower oil
Salt
Eggs or egg powder
Spices and herbs
Yeast
Flavourings
Sometimes stabilisers or raising agents