Tostadas are a delicious and super-easy dish that you can make at home. The contrasting texture of these tostadas with the zucchini and corn is perfect: crunchy tortillas, creamy refried beans, and the smoky touch of grilled vegetables combine to make a treat for your palate. And though it might look like a light dish, i think a couple of these tostadas are perfect for lunch or a weekend dinner, when your grill is on and you want to take advantage of seasonal vegetables. Believe it or not, tostadas are considered a fast-food dish, and they can actually be made with any ingredient on hand: vegetables, beef, pork, chicken, seafood, or just beans with avocado, cheese, and sour cream. I like to put my corn tortillas in a hot oven.