400g/14oz carrots, peeled and cut into 2.5cm/1in chunks
500g/1lb 2oz celeriac, peeled and cut into 2.5cm/1in chunks
250g/9oz parsnips, peeled and cut into 2.5cm/1in chunks
few gratings of nutmeg
flaked sea salt and freshly ground black pepper
50驳/1戮辞锄 butter