If you’re serving the soup with noodles, cook them according to the packet instructions, drain and keep warm.
Cut the French beans into 3cm pieces.
Heat the stock in another saucepan, add the shiitake, soya beans & French beans, then cook for 10 minutes.
Mix the Miso paste in a small bowl with a ladleful of the soup until you get a smooth paste, then add to the saucepan. Turn off the heat.
Put some noodles in bowls, then ladle some soup over it. Scatter some chopped spring onion on top and serve with a dash of lime juice and soy sauce.