Fry the bacon in a pan, stirring occasionally, for about 4-5 minutes on each side. Remove the fried bacon from the pan and transfer to a paper towel to drain off excess fat. Then cut the bacon into small pieces.
Combine bacon, cheese, pimento, mayonnaise, onions, Worcestershire sauce, salt, and black pepper in a bowl, mix well (this mixture can be stored in a refrigerator in a tightly closed container for up to 1 week).
Grease half of all the bread slices with the resulting cheese mass, top with tomato slices and lettuce leaves, cover the sandwiches with the second slice of bread.