Brandy Blue Cheese Sauce

Heat the butter in a pan, add onion, cook, stirring until soft. Add flour, cook, stirring until bubbling. Remove from the heat and gradually stir in stock, milk and brandy, stir over heat until it comes to the boil and thickens slightly. Put into a processor or blender with the cheese and garlic and process until smooth. Serve with any type of beef, roasts, steaks etc. It is supposed to be good over pasta too.