Cook the rice in two cups of water. Bring water and rice to a boil, cover, lower the heat and let it cook until all the water is absorbed.
Add 1 tbs of oil to a wok on high heat. Add half the beef and stir-fry for 1-2 mins. Repeat with remaining beef.
Heat remaining oil over medium-high heat. Add carrots, sweet red pepper, lemongrass, ginger and garlic. Stir-fry for 2 mins. Add soy sauce, sweet chilli sauce and lime juice. Toss well.
Return beef and toss through. Remove from heat and toss in half the coriander and mint. Serve with remaining coriander, mint and rice.