Place your whole peppercorns into a mortar and pestle. Crush them until they are cracked but still chunky. Do not use pre-ground pepper from a shaker. Freshly cracked pepper provides the best aroma and heat.

Melt the butter in your pan over medium heat. Add the diced shallots and minced garlic to the melted butter. Cook them gently for about three minutes. They should become soft and translucent but not brown.

Toss the crushed peppercorns into the pan with the shallots. Stir them for one minute to release their oils. This step toasts the pepper. It makes the sauce smell wonderful and taste much more complex.

Pour the brandy into the hot pan carefully. Use a wooden spoon to scrape the brown bits off the bottom. Let the liquid bubble until most of the alcohol evaporates. This leaves behind a rich flavor.

Add the beef stock and Worcestershire sauce to the pan. Turn the heat up to medium-high. Let the liquid boil and reduce by half. This step concentrates the beefy flavor and thickens the base naturally.

Lower the heat to medium-low. Slowly pour in the heavy double cream while stirring constantly. The sauce will turn a beautiful light brown color. Continue to stir until the mixture is completely smooth and combined.

Let the sauce simmer gently for three to five minutes. It should be thick enough to coat the back of a spoon. Taste it and add a pinch of salt if needed. Serve it immediately while hot.