In a food processor, place the flour and baking powder. Pulse for one second to combine. Add the butter and pulse for a few seconds at a time, until the mixture has a coarse and grainy texture. Add the egg, water and vinegar, pulsing a few seconds at a time, until a ball begins to form. Remove the dough from the processor. Form into a ball with your hands, dust with flour and cover with plastic wrap. Refrigerate for about 1 hour.
Egg Wash
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