For winter vegetable broth, make up the soup as above using just 1 chopped leek and adding 125 g (4 oz) finely diced swede. Simmer for 20 minutes then add 125 g (4 oz) finely shredded green cabbage instead of the mangetout. Simmer for 10 minutes then ladle into bowls and top with diced crispy grilled bacon.