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Butter a small microwave-proof pudding basin. In a separate bowl, rub the butter into the flour and baking powder, then stir in the sugar and sultanas. Gradually add the eggs and milk to make a wet cake mixture.
Spoon into the basin and make a deep hollow in the centre with the back of the spoon. Cover the basin with cling film, pierce with the tip of a knife and microwave on High for 4½-5 mins until well risen and firm to the touch.
Carefully turn the pud out onto a plate and spoon over a generous amount of syrup. Slice and serve with custard.