Whipped Swede Purée with Orange Zest and Ginger

• 1 kg (2¼ lb) swede, peeled and cut into 1cm (½in) dice
• 1 tablespoon grated fresh

This is made in a food processor, which gives a smooth, light, delicate purée.

Put the swede and ginger in a saucepan, cover with cold water and add a little salt. Bring to the boil and simmer for about 20 minutes, until tender. Leave to drain thoroughly in a colander for several minutes, then transfer to a food processor. Add the butter, orange juice and zest and process for a few seco