I season sirloin roast with Montreal steak seasoning. Cook it at 325 until it’s about 135. After it cools a stick in the fridge and then I slice it the next day for sandwiches it is awesome. The sirloin roast is what my butcher recommended I use for making sandwiches instead of an eye roast. Very nice cut of meat
Grilled with that cut a few times (wife prefers top sirloin when we have steak at home).
My 2 cents: cut into 1"-thick steaks, dry-brine with salt for 3-4 hours, then cook to medium-rare/medium on the grill (I prefer good lump charcoal w/ some pecan mixed in).
Pair with a potato of choice, asparagus, and prepared creamy horseradish on the side.