On the bottom half of the sub, arrange the cheese, then ribbons of thin mortadella, then the lettuce and then the fried onions. On the top half of the bun, spread a generous schmear of the Cherry Pepper Aioli.
Cherry Pepper Aioli:
Yield:about 1 1/3 cups
Combine the mayonnaise, cherry pepper relish, mustard, garlic and chives in a medium bowl and stir until well blended.