Chef John's Croissants
Ingredients:
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1 cup warm water (100 degrees F or 38 degrees C)
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1 (.25 ounce) package active dry yeast
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¼ cup granulated white sugar
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3 ½ cups unbleached bread flour
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3 teaspoons kosher salt
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6 tablespoons butter, room temperature, cut into pieces
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2 sticks unsalted European-style butter
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1 egg
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1 tablespoon water