Hi yep synfree, here is recipe but I used much less qtys as only making for myself (hubby uses packet sauce for him), u can also use quark instead of ff but I prefer the ff:
1 onion, chopped
2 garlic cloves, crushed
312ml/11fl oz chicken stock
1 tbs crushed peppercorns
1 tbs worcestershire sauce
198g/7oz very low fat natural fromage frais
salt and freshly ground black pepper
1. Place onion, garlic and stock in a pan and bring to the boil. Reduce the heat, add the peppercorns and worcestershire sauce and simmer for 15-20 mins, or until the sauce is reduced and slightly thickened.
2. Remove from the heat, stir in the fromage frais and season with salt and pepper.
3. Keep the sauce warm until ready to use, but do not allow it to boil or it will curdle.