Tomato and Onion Napoleons

Ingredients
3 large tomatoes, preferably vine-ripened, into 4 slices each
1 large Vidalia, Maui, or other sweet onion, cut into 8 slices
16 fresh basil leaves
16 fresh mint leaves
Freshly ground black pepper to taste
Slice each napoleon in half and arrange on a serving plate in a “V” shape so that it opens to show the interior layers. Remove the toothpicks and drizzle each napoleon with 1 tablespoon of the vinaigrette.