The unsung hero of the vegetable world, knobbly, odd-shaped celeriac has a subtle, celery-like flavour, with nutty overtones. Try it as mash, in big-flavoured, slow-cook dishes, or in its classic form, and as they do in France, as a remoulade.
Choose a firm root that feels heavy for its size. Avoid those that are discoloured.
Jamie Oliver’s idea!