Technical Stages :

• Mince the onions.
• In a stockpan, melt the butter and add the onions.
• Sweat until slightly browned.
• Add flour and stir using a wooden spatula.
• Add gradually the white chicken stock or white veal stock or just water.
• In the bottom of gratin dishes, place a slice of dried bread.
• Add a bit of grated cheese then pour the onion based mixture.
• Add another slice of hard bread and grated cheese once again and finish with an onion mixture.
• Sprinkle a last coat of grated cheese and broil in hot oven (or broiler).
• Serve very hot.