Heat oven to 325 degrees F. Place pork, fat side up, on rack in shallow roasting pan., Season with salt andpepper. Bake 1 hour.
In small saucepan, combine jam, wine or apple juice, rosemary, brown sugar and salt. Bring to a boil over medium heat and cook until lightly thickened. (about 5-8 minutes total, but watch so it doesn't burn). Remove from heat and cover to keep warm.
Spoon 1/4 cup sauce over pork. Continue baking, basting occasionally, until temperature reaches 165 degrees F.