Heat oil in a wok over high heat. Add peanuts and next 3 ingredients; stir-fry 30 seconds. Stir in celery and bell pepper; stir-fry 2 minutes or until crisp-tender. Add shrimp mixture; stir-fry 2 minutes. Add remaining 2 teaspoons soy sauce, 1/2 teaspoon sherry, and broth. Bring to a simmer; cook 1 minute or until slightly thickened. Remove from heat; stir in vinegar and salt. Top with onions.