Panes con mortadela

Instructions

1. Slice the tomatoes and onion into thin rounds and tear the lettuce into pieces.
2. Split the rolls lengthways without cutting all the way through, then spread the inside with mayonnaise.
3. Fold the mortadella into each roll, then add a few slices of tomato and onion.
4. Add the lettuce, a pinch of salt and pepper, then close the bread.
5. Serve straight away, at room temperature.