Lemon Curd

This is a great recipe to use up left over or cheap lemons, limes or other citrus fruit
Melt 4oz butter with 4oz sugar with the juice of three lemons in a bowl over a pan of simmering water.
When melted beat in three egg yolks and continue to cook, stirring all the time, in the bowl over the hot water for 15-20 minutes.
Pour into sterilised jars, cool and keep in the fridge
To sterilise jars wash, rinse and place in an oven on its lowest setting for 10 minutes