Green Goddess 50 Calorie Soup

1 onion, peeled and finely diced
600mls vegetable stock
1 tsp. Anchovy Paste
4 spring onions, trimmed and chopped
450g to 500g assorted green lettuce & salad leaves (such as Batavia lettuce, Iceberg Lettuce, Watercress, Rocket, Spinach and Nettles)
¼ C. chopped Tarragon
small bunch of mint (chopped, about 2 to 2 tablespoons, some left for a garnish)
2 teaspoons cornflour (mixed with a little milk)
200ml skimmed milk (0% fat)
salt and pepper (to taste)
Lemon Juice

Pour the stock into a large saucepan that has a lid and dissolve anchovy paste into liquid; add the chopped onion and spring onions. Simmer with the lid on for 10 minutes, or until the onions are soft. Add the lettuce and green leaves, replace the lid and simmer for a further 15 to 20 minutes, or until the leaves have cooked down and are soft. Add the chopped tarragon and mint and cook for a further 1 to 2 minutes. Transfer the soup to a blender or using a hand-held immersion blender, liquidize the soup until it is smooth. Pour the soup back into the saucepan. Add the corn flour and milk paste to the rest of the milk and then add it to the soup. Bring the soup to the boil and then turn down the heat, making sure you stir it continually until the soup has thickened. Season to taste with salt and pepper. Serve in warmed soup bowls and scatter some chopped mint over the top of the soup as a garnish