I've been making this "sauce" to serve over fish for years. I like it over simple pan fried fish, but you could serve it over crumbed fish too.
- Combine the flour, salt and pepper. Coat the fish in the seasoned flour, shaking off the excess flour. Heat half the butter to foaming over medium high heat in a heavy based pan.
- Cook the fish to your liking and remove to serving plates.
- Add the remaining butter, juice, zest, capers and parsley. Heat for a minute then serve over the fish sharing the capers between the plates.