The ingredient that provides the main flavor and nutritional value; often meat, cheese, or vegetables.

(a)  

A soft substance like mayonnaise or butter that prevents the bread from becoming soggy.

(a)  

This component is added mainly for presentation or to enhance texture, such as olives or pickles.

(a)  

The combination of all parts—bread, filling, spread, and garnish—makes this type of dish.

(a)