If making this sauce with steak, cook steak to your liking first, then proceed with the rest of the recipe, adding to the pan juices.
Heat butter over high heat in a frying pan until foaming. Add and sauté garlic until just starting to brown and quickly add your peppercorns and stir through.
Immediately add beef bone broth, have it ready to go. If you leave the peppercorns in too long the heat will start popping them out of the pan. Stir to combine and bring to the boil.
Add cream and stir to combine. Simmer and reduce until coloured and thickened, stirring occasionally. Season to taste with salt.