Pat the beef sirloin tips dry
Season with salt and pepper
Heat a skillet over medium-high heat
Add oil to the skillet
Sear the beef in a single layer
Cook until browned on all sides
Remove the beef from the skillet
Add onions, garlic, or other aromatics if desired
Deglaze the pan with broth, wine, or water
Return the beef to the skillet
Reduce heat to low
Cover and simmer until tender
Stir occasionally
Cook until the beef reaches desired doneness
Rest the beef for a few minutes before serving
Serve hot