Sauce Robert

Ingredients

• 1 large onion
• butter
• 2 décilitres white wine
• 3 décilitres sauce Demi-glace

Instructions

1. Cook 1 large, fairly finely chopped onion in butter without letting it colour.
2. Moisten with 2 décilitres of white wine and reduce by two thirds.
3. Add 3 décilitres of sauce Demi-glace.
4. Let it cook gently for 10 minutes.