This healthy recipe is perfect for busy weeknights. Simply place a pork loin in a slow cooker with sliced apples and onions, and let it cook on low for 6-8 hours. The result is a tender and flavorful pork loin that is infused with the sweet and savory flavors of the apples and onions. This dish is low in calories and high in protein, making it a great option for anyone looking to eat healthy.