Chef John's Chocolate Croissants

Ingredients (11)

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