This recipe tastes great with Arroz Blanco con Elote y Cebolla and a salad. You can substitute chicken or pork loin for the beef ... or just make the tacos with vegetables!
Heat the oil in a large nonstick skillet over medium heat. Sauté the mushrooms, tomato, and bell pepper until tender, 5 to 7 minutes. Transfer to a plate and set aside.
In the same skillet, sauté the beef over medium-high heat until browned, 7 to 10 minutes. Add the cooked vegetables, then the tomatillo sauce, salt, and black pepper. Cover and simmer for 20 min