Tuna-Stuffed Piquillo Peppers - Piquillo Peppers with Tuna, Bechamel Sauce & Gouda Cheese Learn how to make delicious piquillo peppers stuffed with tuna and topped with bechamel sauce and melted Gouda cheese. This piquillo peppers recipe is easy to make and full of flavor! ▼ INGREDIENTS LIST: - (ingredients for 2 persons) - - 6 piquillo pep