01 -
Arrange the tostada shells on a baking sheet. Heat in a 350°F (175°C) oven for 3 to 5 minutes until warm and very crispy. Alternatively, heat them one at a time in a dry skillet over medium heat for 60 seconds per side.
02 -
Spoon the refried beans into a small saucepan over low heat. Add 2 tablespoons of water and stir until smooth and spreadable. Season with cumin and a pinch of salt. Keep warm on the lowest setting while you prep the toppings.
03 -
Shred the iceberg lettuce into thin ribbons. Dice the roma tomato small. Measure out the cheese and sour cream and have them ready at the counter.
04 -
Take a warm tostada shell and spread about 3 tablespoons of warm refried beans evenly across the entire surface, going almost to the edges.
05 -
Top each shell with a small handful of shredded lettuce first, then a spoonful of diced tomato, then a pinch of shredded cheese. The lettuce layer goes on first.
06 -
Spoon sour cream into a squeeze bottle or zip-lock bag with the corner snipped and pipe a swirl on top of each tostada. Serve immediately with hot sauce on the side.