Bohemian omelets (bohmische omeletten)

3 egg whites
1-1/2 oz. granulated sugar
3 egg yolks
1-1/2 oz. flour
1-1/2 oz. butter (unsalted)
3-1/2 oz. prune mix (see below)
5-1/3 oz. heavy cream

1. Prepare prune mix from 3 1/2 oz. fresh prunes, 3 1/2 oz. sugar and a small amount of water by slowly roasting mix in the oven, then blending and pureeing it and gently flavoring with dark rum.
2. Whip egg whites and granulated sugar to an oily constancy, beat egg yolks until smooth, add to whisked egg whites. Carefully fold in flour. Heat two omelet pans (diameter about 5 1/2") and grease with unsalted butter, pour in batter, carefully bake on low heat for about 3 minutes, Turn omelets, slowly bake other side.
3. Heat prune mix, beat with a small quantity of cream until smooth, coat omelets with prune mix, fold, serve on plates, dust with powdered sugar and garnish with whipped cream and prune mix sauce.