• Put the stock in a large saucepan and bring to the boil. 
  • Add the shallot or onion, garlic, peas and chopped mint. 
  • Cook at a brisk simmer for 10 minutes until the peas are tender.
  • Transfer in batches to a blender and blend until smooth. 
  • Season to taste and serve immediately in bowls, topped with a swirl of fat-free natural yogurt, if wished.