2. Wrap the Beef in Bacon
Lay the bacon slices across the roast, slightly overlapping each piece.
If necessary, tuck the ends underneath the roast or secure the bacon with toothpicks.
Don’t worry if the bacon doesn’t look perfectly neat. It will shrink slightly as it cooks and help coat the beef with its savory flavor.
3. Prepare the Slow Cooker
Place the bacon-wrapped sirloin in the center of the slow cooker.
Whisk together the beef broth, Worcestershire sauce, and Dijon mustard.
Pour the mixture around the roast rather than directly over the bacon. This helps keep the bacon from becoming completely submerged.