Onion Sandwich Au Gratin - cooking recipe

Ingredients

1 1/3 cups onions, sliced
cold water
boiling water
4 slices bread, toasted
4 slices part-skim mozzarella cheese
1 pinch paprika

Preparation

Let soak the onion in cold water for 30 minutes. Drain.
Put the onion in a saucepan. Add boiling water. Bring to boil. Let simmer, covered, until onions are tender. Drain.
Spread the onion on the slices of toasted bread. Garnish each one with a slice of cheese. Sprinkle with paprika. Broil in oven until cheese is melted and ligthly golden.