Heat oven to 350 degrees F. Insert long slicing knife into center of face of pork loin, piercing loin clear through center. Withdraw knife and insert again into face of loin, at an angle perpendicular to the first cut (creating an x in the face of the pork loin). Unwrap frozen smoked sausage. Holding loin in one hand and sausage in other, force sausage into the loin through the x cut in the face of the loin. If sausage is longer than loin, trim off excess sausage and reserve for another use.

Place sausage-stuffed roast on rack in shallow pan. Roast for 35 minutes. In small bowl, stir together remaining ingredients and brush over roast. Continue to roast for 15-20 minutes more, brushing occasionally with glaze mixture from bottom of pan. Remove from oven when internal temperature, measured with a meat thermometer inserted into loin is 150-155 degrees F. (Be careful to insert thermometer probe into loin, not into sausage). Remove from oven; let rest 10 minutes before slicing to serve.