Sprinkle pork with salt and pepper. In a large skillet, heat oil over medium-high heat. Add pork; cook until browned, 4-6 minutes. Remove., In same skillet, cook onion and pepper until softened, 2-4 minutes. Add garlic; cook 1 minute. Return pork to pan; stir in chicken stock. Cook, covered, until pork is tender, about 5 minutes., Stir in next 5 ingredients; simmer, uncovered, until sauce is thickened, about 5 minutes. Serve with rice.