Toasted sun-dried tomato focaccia is layered with deli turkey, salami, provolone, peppery arugula, red onion, juicy heirloom tomato, and a creamy Parmesan mayo that ties all the flavors in. Your deli-style sandwich but at home and in all of 15 minutes.
Slice the focaccia in half, horizontally. Lay the focaccia side by side on a baking sheet, make sure you do not flip the top part over, otherwise, the toppings will fall off. Toast in the oven for 5-7 minutes.
Stir together the mayonnaise, Parmesan, Dijon mustard, lemon juice, Italian seasoning, and a generous amount of black pepper.
Spread half of the Parmesan mayo on the inside of the bottom half of focaccia. Layer the sandwich with turkey, salami, provolone, arugula, red onion, and tomato. Dollop and spread the remaining Parmesan mayo over the tomato slices as best you can.
Place the top part of the focaccia back on top of the sandwich. Gently press down. Cut the sandwich in half horizontally and vertically, into four portions. Serve immediately.