Slide oven rack in. Bake for about 30 minutes or until just set. Cool, then chill at least 30 minutes before serving. Beat whipping cream with 2 teaspoons superfine sugar and 2 teaspoons coffee liqueur, if desired. Top custards with dollop of whipped cream just before serving.
Superfine sugar is available at some supermarkets.
Or you can make it by placing granulated sugar in a food processor and grinding for about 5 seconds. Makes 4 servings. Boulud changes the traditional Sacher torte by using raspberry jam as the filling instead of apricot. We agree - and we increased the filling to cup when we found that the cup called for soaked into the cake. After glazing the cake, you may have ganache left over.