Chef John's Chocolate Croissants
Ingredients:
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½ cup warm water (100 degrees F or 38 degrees C)
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½ (.25 ounce) package active dry yeast
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2 tablespoons granulated white sugar
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1 ¾ cups unbleached bread flour
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1 ½ teaspoons kosher salt
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3 tablespoons butter, room temperature, cut into pieces
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1 stick unsalted European-style butter
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1 cup chopped bittersweet chocolate
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1 egg
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1 tablespoon water
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1 pinch coarse sea salt to taste