method
1. Melt the butter in a pan, add the bacon and fry for 2 - 3 minutes. Add the shallot, carrot and mushroom stalks and fry gently until softened.
2. Stir in the flour and cook, stirring, for 5 minutes or until the roux is dark brown but not scorched.
3. Remove from the heat and gradually pour in the stock, whisking constantly.
4. Return to the heat and cook, stirring, until the sauce is thickened. Add the bouquet garni, tomato puree, salt and pepper. Lower the heat, partially cover the pan and simmer very gently for about 1 hour, skimming occasionally.
5. Strain the sauce into a clean pan, then reheat and skim the surface. Check the seasoning and flavour with the sherry if using.
serving amount
makes 300 ml (1/2 pint)
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