1. Heat chicken fat in a Dutch oven over medium-high heat. Add ground beef and cook until brown. Remove beef and drain all but 2 tablespoons fat.
2. Add onion and garlic and cook 4 minutes. Season with salt. Add chilis and spices.
3. Add vinegar and tomatoes and reduce until thick.
4. Add beef and stir. Add stock and bring to a simmer. Adjust seasoning and simmer ½ – 1 ½ hours until desired consistency.