In blender, purée nori, vinegar, miso paste, soy sauce, chili garlic sauce, lemon juice, honey and ¼ cup water on high until almost smooth; with blender running, slowly add oil and purée until smooth. Makes about 1 cup vinaigrette.
Place salmon in large zip-top plastic bag; pour ½ cup vinaigrette over salmon. Seal bag, pressing out excess air; massage salmon in bag to coat and refrigerate 1 hour.
Soak skewers in water 20 minutes; prepare outdoor grill for direct grilling over medium-high heat. Remove salmon from marinade; discard marinade. Alternately thread salmon, pepper and red onion onto skewers; place on hot grill rack, cover and cook 6 minutes or until internal temperature of salmon reaches 145°, turning frequently. Makes 8 kabobs.
Serve kabobs drizzled with remaining ½ cup vinaigrette garnished with sesame seeds and/or green onions, if desired.