FOR each serving: Spread 1 Tbsp. bistro sauce on each of 2 bread slices. Top 1 bread slice with 1 cheese slice, 3 oz. ham, 2 Tbsp. onions, 1 oz. pears, second cheese slice and remaining bread slice. Spread 2 tsp. butter on outside of sandwich, spreading each bread slice with 1 tsp. butter.
GRILL on medium heat 2 to 3 min. on each side or until cheese is melted and sandwich is golden brown on both sides.