A cracked pepper balsamic mayonnaise turns an ordinary BLT sandwich into an addictive treat that you'll want to make over and over again. Don't be shy with the vinegar; it's what makes the custom mayonnaise truly great.
In a bowl, fold together the mayonnaise, pepper, and balsamic vinegar, to taste.
Spread some of the mayonnaise on both slices of toast, completely covering the bread. Add a piece of lettuce to 1 slice of toast and layer with the tomatoes. Season with salt and pepper, to taste. Place the bacon on the tomatoes and top with the second slice of toast.