Madeira Sauce

Ingredients - 
1/2 cup shallots, sliced 
2 tbsp veg oil 
1 tsp fresh thyme, chopped 
1/2 tsp black peppercorn 
1/2 cup Madeira wine 
2 tbsp sherry vinegar 
2 cups veal stock
Procedure - 
Sweat (cook without color) the shallots in a pan with a very little oil until soft, add thyme, peppercorns, Madeira and sherry vinegar, reduce by 2/3rds Add the veal stock bring to the boil and skim. Simmer and reduce. Reduce to required consistency. Season to taste and pass through a muslin sieve.