Hi Isabeau, it sounds like you followed the directions correctly, but the type of chocolate you used might have caused the seizing. Check out this advice from the Notes From Our Bakers section of this recipe: For easiest melting, use chocolate wafers or disks. Chocolate chips can also work in a pinch, but be sure to melt them slowly and carefully to prevent burning or seizing. See our blog post, The best way to melt chocolate, for details. High quality chocolate wafers or disks are typically meant for melting and may work better for you in recipes like this. 

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