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Preheat the oven to 200°c (fan oven 180°c), gas mark 6. Lightly grease 4 individual deep ramekin dishes with the butter. Put the dishes into a medium roasting tin.
Whisk the egg whites in a clean, dry bowl until stiff, then whisk in the sugar, a spoonful at a time, until it is thick and glossy. Fold in the conserve, then spoon the soufflé mixture into the prepared ramekin dishes.
Bake on a centre shelf in the preheated oven for 12-15 minutes.
Lightly dust with the icing sugar and serve immediately.