Ingredients
Method
1.Put all ingredients except butter in a saucepan and heat gently. Stir well, ensuring sugar is dissolved.
2.Meanwhile, warm a heavy jug or similar pouring vessel with hot water, to prevent it breaking when hot drink is added.
3.Strain hot rum into the heated jug. Pour equal amounts into tumblers or tea cups, then add a small knob of butter to each serving.
