Concentrated Fish Fumet

• 1 pound bones and trimmings of sole
• 1 carrot, chopped
• 1 onion, chopped

Melt butter in a saucepan and sauté fishbones and trimmings with chopped carrot, onion and parsley in a covered casserole for 10 minutes. Add water, white wine, peppercorns and salt, and allow to simmer gently, covered, for 30 minutes. Strain the fumet and use as required.