1.Combine couscous with the boiling water in a medium heatproof bowl, cover; stand for 5 minutes or until liquid is absorbed, fluffing with a fork occasionally.
2.Meanwhile, toast sesame seeds in a heated wok about 30 seconds; transfer to a small bowl.
3.Stir-fry beef in heated wok, over high heat, in batches, until browned; transfer to a small bowl.
4.Stir-fry onion in same heated wok for 1 minute. Add garlic, buk choy and chilli; stir-fry 1 minute. Add stock, sauces and beef; stir-fry until hot. Remove from heat; stir in peas.
5.Top couscous with stir-fry; serve sprinkled with sesame seeds.
Swap beef with chicken, pork or lamb. Stir-fries are best made just before serving. Partially freeze the steak before cutting; this makes it easier to slice thinly.Note