YUMMM!!!
Wash Lemons then finely grate the rind and squeeze the juice into a small saucepan. Add the beaten eggs, sugar and butter cut up into little cubes.
Constantly stir with a wire whisk over the gentle heat until the sugar dissolves and mixture thickens, keep the heat very low and don't be tempted to speed it up or to stop stirring.
Pour into a plastic container and store in the fridge.
Variations: Replace lemons with limes, oranges or tangelo's or passionfruit pulp.