Once oil is hot and shimmering, after about 1 minute, add butter ... followed by Parmesan, capers, mustard powder, garlic powder, white pepper and smoked paprika. Gently keep sauce warm while ...
Melt the butter in a casserole dish over a low heat ... cover with foil and place in the oven while you make the sauce. Pour the trimmings and cooking juices through a fine sieve suspended ...
Stir the Parmesan in by hand and check for seasoning before transferring to a warm bowl. If you are making this in advance, butter a small roasting tin or ovenproof dish, measuring approx.