01 -
Heat a small saucepan on the stove to medium heat. Add butter and allow it to melt completely.
02 -
Whisk in beef stock, Dijon mustard, heavy cream, crushed peppercorns, and salt until fully incorporated.
03 -
Stir regularly as the sauce simmers and thickens for 5-10 minutes, until it coats the back of a spoon.
04 -
Remove the pan from heat to stop the cooking process. Immediately pour sauce over steak or transfer to a serving dish.