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Short answer: mushrooms have a lot of water in them and water puts holes in puff pastry.

Long answer: Puff pastry dough is just layers of filo dough with an oil (usually butter or canola oil) in between. You can make it yourself or buy puff pastry laminated in the factory. Filo dough is a very, very thin, dry dough that becomes extremely fragile when it's moisture-absorption abilities are overwhelmed - which is pretty easy to do. The oil between filo-dough layers in Puff Pastry prevent the layers from bonding together during the cooking process. The leavener (baking soda or powder, depending on your recipie) in filo dough releases gas that pushes the layers of filo dough apart, creating the puffing effect. If too much water is introduced to the filo dough before the dough layers have a chance to puff and cook, the filo dough isn't strong enough to contain the gas and it tears instead of puffing. This leaves mushy, doughy, ugly holes in your beautiful creation. Once the puff pastry is cooked, you can pour all sorts of moisture over the top and it won't hurt anything - which is why you pour the gravy over the top of beef wellington after it's cooked.

Recipie items like fresh mushrooms and spinach have very high moisture contents that cook out early in the process and will put holes in your puff pastry if they are cooked together. In order to get around this problem you can either use dried mushrooms or pre-cook the mushrooms before adding them to your recipe. The latter is usually preferable because of the texture and flavor of dried vs. fresh mushrooms, but sometimes it's not possible to use pre-cooked fresh mushrooms and dried ones are required.

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Q: Why are mushrooms dried out before being used in puff pastry?
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