Black Bean Tostada

Ingredients
lemon juice or other citrus juice
 * 1+1/3 cup dried beans
 * 3 medium onions, chopped
 * 3 garlic cloves, minced
 * 1+1/2 teaspoons cumin
 * 1+1/2 teaspoons ground coriander
 * 1 teaspoon minced chilis
 * 1/4 cup oil
 * 1 medium tomato
 * salt

Directions

 * 1) Pick through, rinse, soak, and cook the dried beans.
 * 2) Cook the beans until tender.
 * 3) Sauté the onions, garlic, cumin, coriander, and chilis in the oil for five to ten minutes.
 * 4) Drain the cooked beans and add them.
 * 5) Mash it around with a spoon or potato masher until most of the beans are mashed.
 * 6) Add the tomatoes and citrus juice.
 * 7) Cover and simmer for 10 minutes or so, stirring to avoid stick-age.
 * 8) You may want to add more salt and pepper.
 * 9) Layer beans, lettuce, cheese, guacamole, and salsa on lightly fried tortillas