Drain the cherries, collect the juice. Stir 2 tablespoons of juice and starch until smooth. Boil up the rest of the juice, 1 tsp. sugar and orange zest. Bind with mixed starch, add cherries, remove from heat.
Grease six moulds (each containing approx. 160 ml) and sprinkle with sugar. Preheat the oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Chop the chocolate, melt with 40 g butter in a hot water bath and let it cool down for about 5 minutes.
Separate eggs. Beat all the egg whites until stiff, adding 50 g of sugar. Stir the egg yolks into the chocolate, then fold into the beaten egg white. Spread the mixture into the moulds. Bake in the oven for about 15 minutes. Dust with icing sugar and arrange with cherries. Serve with: sour cream (also available lactose-free).