Prepare rice according to package directions adding cinnamon stick and using chicken broth for water.
Mix together cumin powder, salt and pepper; reserve 1/2 teaspoon. Rub seasoning mix onto pork and grill to desired doneness.
Melt butter in a medium skillet over medium heat; add reserved cumin mixture, onions, orange juice, and spinach. Saute for 5 minutes. Stir in cooked rice. Serve with grilled pork.