Slice tomatoes. Set aside. Slice mozzarella. Set aside.
To make basil ribbons: take 3-4 large basil leaves and roll, starting from narrow, pointed end. Slice across, in narrow strips. Unroll to release ribbons.
Start with a slice of tomato and place a slice of mozzarella on top. Continue to alternate tomato and mozzarella, layering in a concentric circle patten.
Sprinkle basil ribbons on top.
Drizzle olive oil atop salad. Drizzle balsamic vinegar on top.
Sprinkle salt & pepper on top, to taste.
Circles and ribbons too much? Layer tomato slice, mozzarella slice, and a single, whole basil leaf, in rows.