Preheat your oven to 450°F for that wonderful crust.
Apply olive oil over the roast, ensuring all surfaces are covered.
Combine salt, pepper, garlic powder, and rosemary in a bowl.
Rub this spice mix generously over the roast’s surface.
Line a baking tray with sliced onions and place your seasoned roast on top.
Ensure all onions are covered by the roast to infuse flavor.
Brush melted butter generously over the roast.
Tie the roast with butcher’s twine to help maintain its shape during cooking.
Roast in the oven at 450°F for 15 minutes.
Lower the temperature to 300°F and continue cooking until desired doneness.