Poach the skate in the stock or water with the chopped onion and star-anise. The fish will only take 8–10 minutes. Remove the skate and strain the stock. Reduce the stock by two-thirds and then add the gelatine leaves. This can now be mixed with the shallots and parsley as for the vegetarian recipe. Carefully remove the skate fillets from the bone.
Line the terrine with cling film and l