This recipe is a great way to add some sweetness to your pork loin. The caramelized onions give the meat a sweet and savory flavor that pairs well with roasted vegetables or a fresh salad. The pork is first seared on the stove, then roasted in the oven until it's cooked to perfection. The onions are caramelized by sautéing them in butter and sugar until they're golden brown and sweet. Serve the pork with the onions and some roasted vegetables for a complete meal.