Slice tomatoes. Season with salt and pepper and set aside.
Mix together mayo and hot giardiniera.
Evenly spread eight slices of bacon on a foil lined baking sheet. Place in a cold oven and preheat to 375F. Once your oven comes to temp, set a timer for 20 minutes and let bacon cook, flipping halfway. Remove bacon from the oven and place on a paper towel lined plate.
Sprinkle olive oil on one side of your bread and grate parmesan directly on top. Toast in a pan on medium high heat for 2-3 minutes until golden. Flip and lightly toast the other side for about a minute. Let cool on a wire rack.
Place bread cheese side down and spread giardiniera mayo evenly on each half of bread. Layer tomatoes, basil, bacon, and lettuce. Top with other slice of bread and cut in half.
