Add butter, shallot, garlic, anchovy, curry powder, cayenne, mustard powder and salt in a saucepan. Cook over medium heat for about 6 minutes until the shallots soften and butter becomes golden colour.
Add the capers and the herbs and grind of fresh pepper. Cook one minute more.
Add the whipping cream and lemon juice and heat a couple of minutes until warmed through. Don't over mix. The sauce should not be uniform or emulsified. You should see some separation between the butter and the cream components.
Serve with steak, roast beef or grilled vegetables.
