The term BLT Ingredient refers to the four ingredients that make up a classic BLT sandwich: BACON (5 letters), TOMATO (6 letters), Mayo (4 letters) and LETTUCE (7 letters). BACON is a cured meat made from pork belly, which is usually smoked or fried. TOMATO is a red, juicy fruit that is often used in sandwiches and salads. Mayo is a creamy condiment made from oil, egg yolks, and vinegar or lemon juice. LETTUCE is a leafy green vegetable that is often used as a topping for sandwiches. Together, these four ingredients make up the classic BLT sandwich.