Melt the butter with milk instead of water for the sauce.
Serve the boiled duck covered with the onion sauce.
To roast duck
Stuff the duck or not.
Roast the duck.
Serve with gravy.
Original Text
Duck to boil.
Choose a fine fat duck, salt it two days, then boil it slowly, and cover it with onion sauce made very white, and the butter melted with milk instead of water.
To roast duck: stuff or not, and serve with gravy.