1.Stir Refried Beans In A Saucepan Over Medium-Low Heat Until Hot, 2 To 4 Minutes. 2.Warm Tortilla In A Skillet Over Low Heat Until Softened, 1 To 2 Minutes. Transfer Tortilla To A Plate. 3.Layer Lettuce Onto Tortilla. Spread Warmed Refried Beans, Avocado Slices, And Pico De Gallo On Top Of Lettuce. Roll Tortilla Around The Fillings Into A Burrito Shape.