This is SUCH a great recipe! I found it in a supermarket recipe leaflet, and I have made these tasty little toasted sandwiches regularly since then. They are GREAT for Tapas style appetisers or, serve them for a light lunch or snack. Try to use a high quality chorizo that contains real Spanish smoked paprika. If you cannot source "Membrillo", a Spanish quince paste, then you could use a high fruit content jam or preserve. Serve these as appetisers with glasses of chilled Fino sherry. Alternatively, these can be served for a light lunch or a snack.