Preheat the oven to 450°F
Pat the sirloin roast dry
Season all sides with salt, pepper, and any preferred herbs or spices
Place the roast on a rack in a roasting pan
Insert a meat thermometer into the thickest part of the roast
Roast at 450°F for 15 minutes
Reduce the oven temperature to 325°F
Continue roasting until the internal temperature reaches 125°F to 130°F for medium-rare or 135°F to 140°F for medium
Remove the roast from the oven
Tent loosely with foil
Rest for 15 to 20 minutes
Slice against the grain
Serve immediately