Hi there, Elisabeth! Since these buns go through a baking soda water bath (which releases some of their starch, and makes them sticky), they have a tendency to adhere to the pan as they bake. While you wouldn't ordinarily think to grease parchment paper — isn't it non-stick anyway? — in this case, it's appropriate. Non-stick vegetable oil spray in the way to go and you want an even, fairly decent coating on the paper. We hope this helps! 

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