In a large wok, heat vegetable oil and saute onions and carrots. Add garlic, peas, celery, broccoli and cook for 3 minutes.Stir in rice. Add soy sauce and vegetarian mushroom oyster sauce. Mix well. Cook for 5 minutes.Stir in bean sprouts.In a separate pan scramble eggs. Gently combine eggs in fried rice.Serve rice in a large, deep plate and garnish with scallions.