We grilled the sandwiches on an outdoor grill, not in the oven. Either works fine. Fixings can be: sliced ham, prosciutto, bacon, smoked brisket. Cheeses suggestions: cheddar, Swiss, Havarti, pepper Jack, gouda. Spreads: fig jam, sour cherry jam, chutney, cranberry sauce, whole grain mustard, Grey Poupon. Other: thinly sliced apples, sauerkraut. Get creative!