While working overseas, we often used puff pastry to serve with several dishes, including fish. Puff pastry is basically created by rolling out pastry dough and then adding room-temperature butter followed by a system of folding over and rolling the mixture out in order to form several thin layers of butter and dough. The layered butter is what puffs up the dough when baked. The butter heats up, releases steam and pushes up the layers of pastry, which gives you a soft, buttery-baked pastry.
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