This easy and delicious dessert is a very romantic choice for Valentine's Day.

Beat egg whites until very frothy. Add the sugar and continue beating until they are stiff and shiny, but not dry. Fold into the chocolate mixture.
Pour into pan and bake for 15 minutes. The cake will look very uncooked in the center. Cool. Whip the cream until soft peaks form. Spread a very thick layer over the top of the cake, smoothing with spatula. Shake unsweetened cocoa through a sieve over the whipped cream.

Cut the cake while cold, but let it stand at room temperature for about 15 minutes before serving.