Instructions

  1. If you like your sandwiches toasted, go ahead and toast your bread.
  2. Mix the mayonnaise, mustard, and balsamic together, then spread it thinly on one side of each slice of bread.
  3. Place cheese on a mayo/mustard side of a piece of bread; if including proscuitto, place it on the provolone.
  4. Spread the slices of avocado next, then the tomato, and season to taste with salt and pepper; then top with lettuce and the other slice of bread with the mayo/mustard side facing the lettuce.
  5. Note: using a fully ripe avocado is very important.