Bet eggs, vanilla until well mixed. Add flour and sugar. Beat on high until slightly thickened, about 10 minutes. Stir 1/4 of this into chocolate mixture. Then fold chocolate mixture back into the rest of the egg mixture. Turn into pan w/ hazelnuts and bake in preheated 325 degree oven for 40 minutes until slightly puffed. Cool completely, 3-4 hours. Cover and refrigerate.
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