hoisin sauce • reduced-sodium soy sauce, plus more for serving (optional) • rice wine vinegar • sesame oil • sriacha • large bok choy, cut into 3-inch pieces • sweet red peppers, seeded and cut into 1/2-inch strips • small shiitake mushrooms, stems removed • canola oil • jumbo shrimp, peeled & deveined • toasted sesame seeds • chopped scallions (optional)
