Special equipment: 9-inch springform pan
Preheat the oven to 350 degrees F. Line the bottom of the cake pan with baking parchment.
Melt the chocolate either in a double boiler or a microwave, add the butter and let melt in the warm chocolate.
Beat the 2 whole eggs and 4 egg yolks with 1/3 cup of the sugar, then gently add the chocolate mixture, the orange-flavored liqueur and the orange zest.
In another bowl, whisk the 4 egg whites until foamy, then gradually add the remaining sugar and whisk until the whites hold their shape but are not too stiff. Lighten the chocolate mixture with a dollop of egg whites, and then fold in the rest of the whites. Pour into the prepared pan and bake for 35 to 40 minutes or until the cake is risen and cracked and the center is no long wobbly. Cool the cake in its pan on a wire rack; the middle will sink as it cools.
When you are ready to eat, place the still pan-bound cake on a cake stand or plate for serving and carefully remove the sides of the pan from the cake. Don't worry about cracks or rough edges, it's the crater look we're going for here. Whip the cream until it's soft and then add the vanilla and orange-flavored liqueur and continue whisking until the cream is firm but not stiff. Fill the crater of the cake with the whipped cream, easing it out gently towards the edges of the cake, and dust the top lightly with cocoa powder pushed through a tea-strainer.
Recipe courtesy Nigella Lawson, 2007
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