Jamie Oliver series up zombie brain, a magnificent vegetarian dish made with whole-roasted celeriac, mushroom sauce and barley that is approximately £1.49 per portion.

Jamie says: “Mind-blowing flavours come from the slow-roasting of this whole celeriac. I’m fully aware that the general scenario and name might seem very weird, but vegetarian, meat-atarian, whoever you are, please open your mind and have a go at this bad boy – it’s delicious, fulfilling, funny, and you’ll get people talking.”

The ingredients are: “1 large celeriac, olive oil, 6 sprigs of fresh thyme, 7 fresh bay leaves, 6 cloves of garlic, 30 g unsalted butter, 200 g pearl barley, 1 small onion, 800 g mushrooms, ¼ of a cube of vegetable stock, 150 ml single cream, 1 heaped teaspoon English mustard and extra virgin olive oil.”