A roux is an equal mix of fat and flour cooked together to make the base of various sauces, including white sauce (béchamel) and gravy. Basically it’s a thickening agent and a particularly nice one if ...
This Guinness, steak, and cheese pie recipe ... place the pan on the hob and reduce until the sauce thickens. Remove from the heat and stir in half the cheese, then season carefully and leave ...