Combine the parsley, garlic, salt, pepper, and one tablespoon of olive oil in a food processor. (Also add Worceshire if using).
1 cup fresh parsley leaves, 2 cloves garlic, 2 tablespoons olive oil, 1 teaspoon black pepper, 1 teaspoon sea salt, 2 tablespoons Worcestershire sauce
Pulse until just combined.
Rub the parsley and garlic mixture over the entire surface of beef.
1½-2 lbs beef top sirloin petite roast
Add the remaining oil in a roasting pan. Place the rooast into the prepared pan.
2 tablespoons olive oil
Roast in 325°F oven for 60 to 75 minutes for medium-rare to medium doneness.
Use a digital meat thermometer and remove when the internal temperature of the meat reaches 135°F for medium-rare or 150°F for medium.
Loosely cover the roast with aluminum foil for the roast to rest for about 10 minutes. (The temperature will continue to rise about 10°F as the meat rests.)
Transfer to a cutting board and cut into thin slices to serve.