Chef John's Chocolate Croissants

Details

Ingredients

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