Heat the oven to 400°F and arrange the bacon in a single layer on a foil-lined sheet pan.
Bake for 16 to 20 minutes until crisp, then drain the bacon on a rack.
Season the tomato slices with the salt and let them drain on paper towels for 10 minutes.
Toast the bread and stir the coarse black pepper into the mayonnaise.
Spread all 8 toast slices with pepper mayonnaise and layer 4 with lettuce, 3 tomato slices and 3 bacon slices each.
Close the sandwiches, cut each in half and serve before the toast softens.