1. Shell and de-vein prawns. Wash and dry. Season prawns for 10 minutes.
2. Skin and dice water chestnut. Remove seeds and dice green pepper and red pepper. Soak mushroom and dice.
3. Par-boil corn, water chestnut and mushrooms in boiling water for 3 minutes. Drain.
4. Par-boil prawns in oil.
5. Heat wok. Add 2 tbsp oil. Stir-fry assorted vegetables and prawns. Add in sauce and stir well. Serve.