Preparation time: 10 minutes
Cooking time: 8 minutes

1. place the chocolate in a heat-proof bowl and melt over simmering water or in the microwave; when melted and still warm, whisk in the butter; 
2. in another bowl, beat 4 egg yolks with the sugar until pale and light; mix in the flour and chocolate-butter mixture; 
3. beat the 4 egg whites to stiff peaks; fold gently into the batter; 
4. pour into 6 individual buttered molds or ramekins; bake for 8 minutes in a preheated 210° C (425° F) oven;
5. let cool for 2 minutes before unmolding.