1. In a jug, mix the Marmite with 600ml of boiling water and set aside while you cook the vegetables

2. Heat the oil in a large pan or wok on a medium to high heat, then add the mushrooms, leek and chilli and fry for 10-15 mins until softened, then add the soy sauce and Marmite mixture and stir. Bring to the boil for 5 mins

3. Cook the noodles according to instructions. Drain and add to the vegetable mixture. Reduce the heat, add the cashew nuts and simmer for 5 mins

4. Serve in two separate bowls and sprinkle the sesame seeds evenly