1. Chop stewed apricots or stewed pitted prunes finely or rub through a course sieve.
2. Place in a saucepan with the salt, sugar, and lemon juice; cook until the mixture is like jam. Cool.
3. Beat the egg whites until stiff; fold in the fruit pulp.
4. Pile lightly in a buttered baking dish; set the dish in a pan of hot water.
5. Bake in a moderate oven until the center is firm to the touch when pressed lightly with the forefinger.