Warm the coconut oil in a deep skillet over medium heat. Add the onion and cook for 3 minutes, then stir in the garlic.
Add the ground beef. Break it into small pieces and cook, stirring, until browned. Carefully drain excess fat if needed.
Stir in the sweet potato, tomato paste, oregano, water or broth, salt and pepper.
Cover and simmer for 15–20 minutes, stirring occasionally, until the sweet potato is tender. Add a little water if needed.
Check the beef mixture in several places with a food thermometer: ground beef must reach 160°F. Serve warm.
Cook and store with care
Ground beef: 160°F, checked with a food thermometer. Color alone does not establish doneness.
Refrigerate leftovers in shallow containers within 2 hours, or within 1 hour above 90°F. Keep the refrigerator at 40°F or below. Use leftovers within 3–4 days or freeze them. Reheat to 165°F with a food thermometer.