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Procure three flavorful, ripe but firm tomatoes. Two balls of fresh mozzarella of good quality (should be packed in liquid). Slice tomatoes and cheese to a width of about an eighth of an inch. Alternate slices with some overlap. Sprinkle liberally with salt. Drizzle generously with extra-virgin olive oil. Shred leaves of fresh basil (preferably Genoa), place on tomatoes and mozzarella. Allow to stand for 10-15 minutes. Good with crusty bread.
Many embellish on the above, but I see no need to. Also avoid the cherry tomato/ciliegine idea you see in delis. The two need to be cut to release their flavor.