The flavors of the herbs and hazelnuts roasted along with the lamb cutlets are utter heaven here, but you could use almonds or pine nuts instead if you prefer. The last time I made this dish was at my good friend and London theater queen Sally Greene’s house. Since it was a large supper gathering, I prepared the pea and wild garlic purée ahead in the morning, along with the lamb cutlets right up to the stage of putting them in the oven, so it was very easy to serve.