Step #1 Place roast, fat side up, on a rack in a shallow roasting pan, & place this in an unheated oven.
Step #2 Turn the oven on to 350 degrees F, & roast the meat, uncovered for 3 hrs.
Step #3 About 30 mins before the end of the roasting time, insert a meat thermometer into the center & continue roasting until the thermometer reaches 170 degrees F.
Step #4 Meantime, slowly stir the apple butter into the peanut butter, then add the orange zest & juice.
Step #5 When the internal temperature of the roast reaches 170 degrees F, brush the apple butter mixture over the entire exposed surface of the roast, then continue cooking for another 15-20 mins.