Long-Fermentation Sourdough Bread

Details

Ingredients

• 2 cups all-purpose flour
• 1 cup water
• ⅓ cup sourdough starter
• 3 tablespoons butter, melted
• 1 tablespoon white sugar
• ¾ teaspoon sea salt
• 1 teaspoon oil, or as needed
• ½ cup all-purpose flour, or more as needed
• 1 teaspoon butter, or as needed
• 1 egg, beaten