Heat a large skillet with a tight-fitting lid over medium heat. Add ground pork, onion, and garlic; cook and stir for 10 minutes or until pork is cooked through.
Add next 5 ingredients (salt through diced sweet potato).
Reduce heat, cover and cook for 10 to 15 minutes or until sweet potato is tender. Uncover skillet, add the spinach then toss and serve.