Combine glaze ingredients together in a small bowl.
Season shrimp with salt and place on doubled skewers to make 4.
Heat a clean, lightly oiled grill to medium heat, when the grill is hot add the shrimp, careful not to burn the skewers. Grill 4 minutes on one side, turn and cook 2 minutes. Brush the glaze on the shrimp, turn and brush on the remaining side. Cook and additional minute or until the shrimp is opaque and cooked through.
Transfer to a platter, brush with any remaining glaze and top with sesame seeds and scallions.