This is from the classic "Jane Grigson's Vegetable Book". Jane Grigson is the mother of Sophie Grigson, the UK cookbook writer better known to many users of Zaar. Jan Grigson's "Vegetable Book" and "Fruit Book" are a delight to read, and to use, with great descriptions of the origins and meanings of the ingredients. The "Vegetable Book" was first published in 1978, and is still relevant and contemporary. This recipe sounds fiddly at first, but once you get a grip on the technique it's easy and can also be used with new potatoes, turnips and carrots.