01 -
Heat a small saucepan on the stove to medium heat. Add butter. When it melts, whisk in beef stock, mustard, heavy cream, crushed peppercorns, and salt.
02 -
Stir regularly as sauce thickens for 5-10 minutes. Once the sauce is thick enough to coat the back of a spoon, remove the pan from heat to stop the cooking.
03 -
Immediately pour sauce on food or transfer to a sauce cup.