Roasted peppers and tomatoes make an unbeatable combination. Piquillo peppers, with their smoky, sweet piquancy, have a unique and irresistible flavor. Piquillos, a trademark ingredient of Spanish cooking, are a variety of sweet red pepper that is roasted over oak fires and hand peeled. They can be found, jarred, in specialty food shops. Keeping a jar of these delicious peppers on your pantry shelf is a good habit to fall into.
Build your own: You can substitute roasted sweet bell peppers, but the ketchup will not have quite the same wonderful, aromatic flavor.