Ingredients Dough 2 tablespoons butter (or 1.5 tablespoons olive oil) (see notes) ~2 teaspoons brown sugar 1 cup (230g) warm water 300g (~1.5c) sourdough starter (fed or discard) 4-5 cups (480-600 grams) unbleached, all-purpose flour Poaching 1 tablespoon brown sugar 1 tablespoon baking soda Topping Egg or egg white,...