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Bring heavy cream and corn syrup to a boil. Pour cream over chocolate, let stand for 1 minute.
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Stir mixture until smooth. Begin with small circles in middle then move onto an outward stir. Add butter and stir well to incorporate (using spatula). Add in Hoisin Sauce and repeat.
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Cover bowl and place mixture in refrigerator for 10 minutes.
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Stir batter mixture and transfer to a ready-made pastry bag. Squeeze out batter to form small balls on parchment paper and let stand for 5 minutes.
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Sprinkle powdered sugar and serve.