Food in a shell is a term used to describe food that is served in a natural or artificial shell. Examples of food in a shell include eggs, tacos, and oysters. Eggs are a common food that is served in a shell and is made up of a hard-boiled EGG white and a soft-boiled EGG yolk. Tacos are a Mexican dish that is served in a fried or soft shell and is usually filled with meat, cheese, and vegetables. Oysters are a type of seafood that is served in its own shell and is often eaten raw or cooked.