Peel and slice potatoes

Wash leeks and slice into chunks

Soak sprigs of thyme in boiling water.

Put all the ingredients into a pan and bring to a boil, lower to a simmer for approx. 10 minutes until the potatoes are cooked but not mushy. (use some of the thyme water to make us your vegetable stock)

Place in liquidizer and whizz until smooth.

Adjust seasoning and add more milk if the soup is a little too thick.

To clean leeks keep the root on and slice down through the centre. Then wash them under the cold tap making sure all the mud which collects between the layers is washed away