The term 'Burger Extra' can be broken down into two crossword solutions: CHEESE (6 letters) and BACON (5 letters). CHEESE is a dairy product made from the pressed curds of milk, usually from cows, goats, or sheep. It is widely used in cooking and is available in a variety of forms, such as cheddar, mozzarella, and Swiss. BACON is a type of cured pork that is typically served in thin slices. It is often used as a topping for burgers, sandwiches, and salads.