Celeriac, a kind of edible celery root, is not hard to grow but not easy to find in shops. It makes a good purée, cooked with equal quantities of potato with the last-minute addition of cream and butter. The gratin below will serve six people as a side dish or four if it is eaten as a main course.
Blanch the celeriac in boiling salted water for 3 minutes. Butter a gratin dish and fill with alternate layers of potatoes and celeriac, seasoning as you go. Mix together the fromage blanc and the cream and pour over the vegetables. Dot with the remaining butter and cook uncovered at
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