Corned Beef with Cabbage with chive

1 egg yolk 1/2 teaspoon dry mustard 1 pinch cayenne pepper 1 tablespoon water 1/2 cup butter , melted and warm (1 stick) 2 tablespoons lemon juice kosher salt[...]

1 kg piece corned beef (silverside) 1 1/2 tablespoons brown sugar 2 tablespoons vinegar 1 teaspoon peppercorn 2 bay leaves 1 onion , chopped 1 Place corned[...]