This dish is great for a fast light lunch or as a tray of appetizers. The peppers are sweet and spicy and the tuna is fresh and salty. Just a note: Whole piquillo peppers can usually be found in the gourmet or pickle aisle of your grocery store. A standard 12 ounce jar holds 12 whole piquillo peppers, but for this recipe, you will only need 4 peppers. Serve with sliced hard boiled eggs.