Cook the rice following pack instructions, then drain. Heat the oil in a non-stick wok over a high heat and fry the ginger and red onions for 2 mins. Add the broccoli stem, carrots and chilli, if using, and cook for 1 min.
Tip in the chicken and cumin, stir-fry briefly, then add the broccoli florets and 3 tbsp water. Cover and leave to steam for 3-4 mins, or until the broccoli florets are just tender and the chicken is cooked through.
Meanwhile, mix the peanut butter with the tamari and vinegar. Stir the sauce into the veg and chicken, then serve over the cooked rice.
