- Place the leeks into a pan with the butter, cover and cook slowly over a low heat for around twenty minutes.
- Add the potatoes and bay leaves and cook for a further five minutes, stirring occasionally.
- Pour in the water and bring to the boil.
- Turn the heat down and leave to simmer for twenty minutes.
- Remove the bay leaves and add crumble in the cheese, then whizz the soup into a creamy puree in a food blender.
- Season with black pepper and stir in the yoghurt.
- Serve with a little crumbled cheese stirred in at the last minute.
Source: Our Collection - Farmison