Beat the egg whites with a pinch of salt until stiff. Melt the chocolate. Beat the butter with sugar until lightly creamy. Stir in the melted chocolate. Stir in flour and baking powder. Finally fold in the egg whites.
Pour the dough into a greased, floured frying / baking pan, bake at medium heat (200 ° C top / bottom heat) (approx. 30 min.).
Halve the base, coat with currant jam, put the halves together and coat with chocolate glaze.