This is a recipe for healthy sandwich bread that can be easily made in a frying pan without using an oven. Mix cold water and yeast, add bread flour and salt, and knead well by hand. After the first fermentation and cold fermentation, let it rise again at room temperature for the second fermentation. Roll out the fermented dough thinly, cook both sides in a non-preheated frying pan, place mozzarella cheese on one side and fold in half, and finally torch the surface with a kitchen torch to give it a fragrant color and flavor. Fill this bread with arugula, tomato, pickles, ham, etc., and you'll have a flavorful homemade sandwich.