Purple Congo Potato Purée

• 500 g (1 lb 2 oz) purple congo potato
• 3

Peel, then chop the potato into equal pieces, place in a saucepan of cold water and bring to the boil. Reduce the heat to low and simmer until cooked through. Drain and transfer to a food processor with the remaining ingredients and process until smooth. Pass through a fine sieve. Set aside and keep warm.