Chemistry of A Pastry
Different kinds of pastries are made by the nature of wheat flour and also due to certain types of fats. When wheat flour is kneaded into plain dough and made with water it develops strands of gluten, which are what make the bread tough and elastic. In a typical pastry, however, this toughness is unwanted so fat or oil is put in to slow down the development of gluten. It is common to use lard or suet here because they have a coarse, crystalline structure that is very effective. Using only unclarified butter does not always work well because of its water content; clarified butter is virtually water free. Shortcrust pastry using only butter may develop an inferior texture. If the fat is melted with hot water, or if liquid oil is used, the thin oily layer between the grains offers less obstacle to gluten formation and the resulting pastry is tougher.
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