Madeira Sauce

Directions

1. 1
   Saute the onions in a hot pan until they are well browned then add the Madeira.
2. 2
   Reduce the liquid by half, add the stock and then reduce by half again.
3. 3
   Season with salt and pepper.
4. 4
   Pass through a sieve, then add the butter.
5. 5
   Serve warm.