Recipe Method

1. Dice the onion.  Add butter and onion to a large frying pan over a medium heat.
2. Chop the mushrooms into small pieces and add to the pan once the onion has become translucent. Stir the mixture
3. Add the sherry to the pan and cook off the liquid
4. Sprinkle the flour and beef stock powder into the pan and keep stirring
5. Stir in the cream
6. Season with salt and pepper