Ingredients

• 4oz/45g butter
• 1oz/30g flour
• ¾ pt/425ml milk
• 1oz/30g caster sugar
• 3 tbsp/45ml rum

Method

1. Melt the butter in a saucepan, add the flour and cook slowly for 1 minute. Take the pan off the heat.
2. Gradually add the milk, stirring all the time. Return to the heat and, still stirring, bring to the boil. Simmer for 2 minutes.
3. Pour in the sugar and rum.

Notes