BLT

A BLT is a sandwich traditionally made with crispy bacon, fresh lettuce, and ripe tomato, layered between slices of toasted bread and spread with mayonnaise. The core combination highlights the contrast between salty bacon, crunchy lettuce, and juicy tomato. While the basic elements are standard, cooks vary the bread type, the amount of mayo, and the inclusion of extras such as cheese, avocado, onion, or herbs.

Origins and usage: The exact origin is uncertain, but the bacon–lettuce–tomato combination became associated with American casual dining in the early to mid-20th century. The BLT acronym gained prominence in menus and cookbooks by the mid-century, helping establish the sandwich as a staple of lunch culture in the United States and, later, elsewhere.

Variations and nutrition: Vegetarian or vegan versions swap plant-based bacon for the meat and may omit mayo. Common variations replace or augment bread or add extras such as avocado or fried egg. A variation that includes avocado is sometimes called a BLAT (bacon, lettuce, avocado, tomato). Depending on ingredients and portion size, the sandwich can be high in fat and sodium, but adjustments to bread, mayo, and fillings can alter its nutritional profile.