Steam the broccoli for 2-3 minutes until almost tender. Meanwhile, heat the oil in a wok or large frying pan, add the onion and mushrooms and stir-fry for 6-8 minutes until browned. Add the garlic, lamb, stir-fry sauce and 3 tablespoons water. Stir-fry for 2-3 minutes until hot.
Stir in the broccoli and stir-fry for a further 1-2 minutes until hot.
Cook the rice to pack instructions and serve with the stir-fry.