Instructions: Preheat the oven at 200C. Slice the onions and fry it in some butter until light brown. Add the litre of stock. Let cook 10 minutes, but not boil. Pour in the dish, add the Swiss cheese. Let gratiner for five minutes.

If you would like to email yourself the recipe for later use, or share the recipe with your friends or family, enter the email addresses below and this recipe will be emailed to you and others as well.