Appetizers recipes--Sliced bread au gratin

INGREDIENTS
- Onion.
- Sliced bread.
- Grated cheese.
- Mayonnaise.

DIRECTIONS:

Cut the slices of bread in triangles.
On it, place a layer of grated onion, a layer of mayonnaise and sprinkle with grated cheese.
Take to the oven and cook au gratin for a while.
Servings: 4 people