Break the chocolate into pieces, melt over low heat with 1/3 pound of butter cut into pieces. Mix the sugar with the egg yolks until the sugar melts. Add the melted chocolate, stirring vigorously. Beat the egg whites stiffly, fold into the mixture. Divide the mixture into 2 equal parts. Chill one, add the flour and baking powder to the other. Stir until completly absorbed. Butter and flour a 9-inch sandwich pan. Pour in the dough up to 1/2 inch from the edges. Bake in a moderate oven (400F) for 15 to 20 minutes. Check the baking with the blade of a knife which must comes out dry. Allow to cool in the pan. Turn out on a serving dish. Spread with the mousse which was kept aside. Serve immediately.
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1/3 lb eating chocolate
1/2 cup sugar
1/3 lb butter
3 eggs
2 heaped tbsp flour
1/2 package baking powder
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25
mn
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20
mn
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If the cake must stand, chill in the refrigerator.
