white or blue masa corn flour, 1/2 cup boiling water, Tbs corn oil • ground beef • dry black beans, clove of garlic, tsp coriander • sofrito sauce, optional • shredded lettuce, greens, cabbage, or sweet green peppers • grated cheese, like aged Tillamook white cheddar • Tomato, chopped • ripe avocado, chopped • chopped pickled jalapeno pepper • chopped green onion or fresh cilantro • chopped red onion • fresh thick greek yoghurt or sour cream •