Place the pork inside of a zip lock bag and place the bag inside of a large bowl. Add 2 cups of Jimmy’s Apple Wine to the pork inside the bag. Make sure the pork is submerged in the wine; add more if necessary to cover the pork. Close the bag if possible and place in the refrigerator for approximately 2 hours.
While the pork is soaking up all that great wine, mix the brown sugar, salt, pepper, and garlic powder together. Slice onions and apples and place in a bowl, set aside.
Remove pork from refrigerator, reserve the wine. Sprinkle seasoning/sugar misture all over the pork trying to coat evenly. Turn on heavy frying pan to medium/high heat. Brown the pork evenly on all sides. After browning the meat add the onions and apples to the pan. Reduce heat down to medium/low and add the reserved wine from your zip lock bag to the pan. Cover and cook until onions and apples are tender and the pork reaches an internal temperature of 160 degrees F.
Remove pork and allow resting on cutting board for a few minutes. Slice and serve with apples and onions.