Combine ingredients, except pork & fresh Saskatoon berries, in food processor and whirl until smooth. Place pork in a shallow pan and pour half of the glaze over it. Cover and marinate in refrigerator for 1-2 hours.
Remove pork from marinade. Heat BBQ to high and quickly sear tenderloins on all sides. This will take 2-3 minutes. Turn off one burner, reduce heat to medium, and place pork over unlit burner to grill with indirect heat until just cooked through and still pink inside (about 30-40 min.) brushing with reserved marinade every 10 minutes to glaze.
Remove pork from grill and let rest, covered, for 5 minutes before slicing into 1 ½ inch pieces. Reheat remaining marinade to boiling and drizzle a little over pork, then scatter fresh Saskatoon berries over top.