2) Combine the mayonnaise and tomato ketchup in a small bowl. Spread four slices of the bread with about 1 tbsp of the mixture and cover with a lettuce leaf. Place three rashers of the bacon on top of the lettuce and then add a layer of tomato slices on top of the bacon.
3) Slice half the breast of the rotisserie chicken into thick pieces and place a slice of the chicken on top of the bacon. Sprinkle liberally with salt and pepper. Reserve the remaining chicken.
4) Spread each of the remaining four slices of bread with 1 tbsp of the mayonnaise/tomato ketchup mixture and place, dressing side down, on the sandwiches. Cut in half and serve.