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Butter the sides and bottom of a 10-inch springform pan and set aside.
In a medium mixing bowl, whisk together the eggs, sugar and vanilla until frothy. Whisk the eggs into the melted chocolate until combined. Pour the mixture into the prepared pan. Bake for 1 hour and cool on a wire rack until it reaches room temperature.
Remove the sides of the pan, cover with plastic wrap and refrigerate overnight, before serving.