Put the noodles inside a heatproof bowl. Cover with boiling water. Put aside for several mins to soak. Drain well.
Meanwhile, heat the oil inside a wok over high temperature. Add some mince and stir-fry for five mins or until cooked through. Add some onion, lemongrass and ginger root and stir-fry for thirty seconds or until aromatic. Add half the sweet chilli sauce and stir-fry for 1 min or until well combined. Remove from heat.
Add some noodles, carrot and half the coriander towards the wok. Toss to mix.
Divide lettuce leaves among serving plates. Spoon mince mixture among leaves. Drizzle with remaining chilli sauce and top with mint, peanuts and remaining coriander.
We still some details of your stuff