Add enough water to the fruit juices to make 1 quart of liquid; put 1 1/2 pints of this over the fire with the sugar. With the rest smooth the cornflour and mix with it the eggs well beaten. When the liquid in the saucepan is near the boil, stir into it the mixture of egg and cornflour. Keep stirring the mixture over a gentle fire until it has cooked 5 minutes. Turn it into a wetted mould and allow to get cold, then turn out and serve.