1.Preheat oven to 200°C (180°C fan-forced).
2.Place roll halves on an oven tray, cut-side-up; spread each half with sauce. Top with half the cheese.
3.Sprinkle 12 roll halves with salami, olives and half the onion. Sprinkle remaining halves with ham, pineapple and remaining onion. Top with remaining cheese.
4.Bake for about 10 minutes or until cheese has melted.
The rolls can be prepared for baking up to 12 hours ahead; keep, covered, in refrigerator. Not suitable to freeze. Not suitable to microwave.Note