Banging Beef And Veg Stir Fry

• 1 tbsp sesame oil
• 300 g beef sizzle steaks, sliced
• 1 large brown onion, cut into wedges
• 100 g broccoli, cut into florets
• 60 g pak choy, ends removed
• 1 large carrot, cut into semi circles
• 1 red capsicum (pepper), thinly sliced
• 2 tbsp oyster sauce
• 250 g brown rice, cooked