Meatball sandwich is made with meatballs and are quite popular in the US. Meatballs are made with ground meat that is usually fried and seasoned with spices like onion, garlic and onion salt. The meat may also be baked, steamed or braised in sauces. Meatballs often contain breadcrumbs and eggs. Meat balls may be made from beef, turkey, chicken or ham.