Brown the ground meat in a large stock pot over medium heat. Season to taste with salt, pepper, garlic powder and onion powder as it cooks. Stir in 1 Tbsp. of the Worcestershire sauce. Remove the meat from the pot.
Grate the onions using a box grater or food processor. Add them to the pot with the diced green bell pepper. Saute the onions and peppers until soft.
Stir in the minced garlic. Season again with salt and pepper. Stir in the dry spices and the remaining Worcestershire sauce.
Pour in the tomatoes and masa flour. Stir well to combine. Simmer over low heat for 20-30 minutes and up to several hours. Serve warm.