Put about a gill of water in a saucepan, with a bit of butter the size of a walnut. Put the saucepan on the fire; as soon as it boils up, add one tablespoonful and a half of flour; work the mixture at the side of the fire. This paste should be of a good, rather firm, consistency. Put it on to a rather flat dish. Butter the surface lightly, to keep it from drying, and put it to cool.