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 ...
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 ...
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.