Combine the first 8 ingredients together thoroughly in a small bowl - this will make a Seasoning Mix. Slice the steaks (cold meat is easier to slice) into strips about 4 inches long by ¼-inch thick.
Place the meat in a large bowl and add 3 tablespoons of the Seasoning Mix, the lime juice, and vinegar, and mix thoroughly with your hands. Cover the bowl and allow the meat to marinate at room temperature about 2½ hours.
Combine the green and red bell peppers and onions in another bowl. Strain the marinade from the beef into the vegetables. Stir in ¼ cup of the oil and 1 tablespoon plus 1 teaspoon of the Seasoning Mix. Mix thoroughly with your hands.
Add another 1 tablespoon of the Seasoning Mix and the remaining ¼ cup oil to the meat and rub in well with your hands. Heat a 12-inch cast iron skillet over high heat until very hot, about 8-9 minutes. Using tongs, add the meat to the skillet in batches and cook until browned on both sides, about 2-3 minutes. (Be sure to allow the skillet to get very hot before adding each new batch of meat.) Remove the meat to a bowl.
Let the skillet get very hot again, add the vegetables using a slotted spoon, and cook, tossing often with the spoon, until crisp-tender, about 4-5 minutes. Remove the peppers and onions from the pan with a slotted spoon or tongs, leaving the liquid in the skillet and add the meat. Toss to mix.
Add any liquid remaining in the marinating bowls to the skillet and cook over high heat, stirring and scraping the bottom of the skillet, until thickened. Pour over the meat and vegetables and toss to coat.
Meanwhile, heat the tortillas quickly in a skillet. Top each tortilla with ½ cup of the meat mixture and ¼ cup of the Guacamole and roll up. Top each burrito with another 2 tablespoons of the Guacamole and serve immediately.NOTE: These are the ground chile peppers we used. You can use whatever peppers are available in your area, but try to use a variety of heats for a "round" flavor. Don't use commercial chili powder