Cut the mushrooms into bite-sized pieces.
Heat the oil in a frying pan over a medium heat and sauté the mushrooms for about 8 minutes until softened.
Add the garlic and salad onions and stir-fry for 1 minute.
Stir in the soy sauce and rice vinegar, allowing it to bubble for a minute.
Add a splash of water along with the broad beans. Cover and cook for about 5 minutes, or until the beans are tender.
Stir in the cooked rice and heat through gently until warmed.
Taste and season with salt and pepper as needed.
Fold in the rocket or watercress just before serving.