Heat a wok or large frying pan over medium-high heat. Add 1 tablespoon sunflower oil, 1/2 onion, sliced, 7-8 broccoli florets and the seasoned king prawns and stir fry for 1-2 minutes until the prawns just begin to change colour. Add 1/4 teaspoon MSG, 1 teaspoon chopped garlic in oil, the prepared sauce and 200 millilitres light chicken stock. Mix well, bring to the boil and simmer for 2 minutes until the sauce reduces slightly.