Melt butter in a saucepan. Remove from heat and mix the flour, using a wooden spoon. Cook for 1 minute. Add a little milk and mix well. Return to heat and gradually add milk, stirring all the time. Boil for 2 – 3 minutes. Add sugar whilst hot to dissolve to taste. Add rum. Use as desired.
—Sandra Boyle used for christmas puddings, particularly nice on fruit cakes