I bought a vacuum sealed 10 kilo USDA choice sirloin from costco. I want to slow roast it at under 300F. How long? Should I sear it?

You bought a 22 pound sirloin roast?

At 325 degrees it's 25 minutes a pound for rare. I'd go from there. And I wouldn't sear it, not if it's a good piece of meat.

My slow cooker won't handle anything that big - or are you talking about slow cooking in an oven?

If so, rare, medium, well - ?

Can your oven comfortably fit that amount of roast in one go.

While 25 minutes per pound will be rare, there's a good chance the centre of the piece won't even get warm, let alone cooked..

Can your oven comfortably fit that amount of roast in one go.

While 25 mins per pound will be rare, there's a good chance the centre of the piece wont even get warm, let alone cooked..


If guesses count I'm guessing it's rolled as opposed to lugging home a quarter of a cow. But, again, it's only a guess.

A meat thermometer - in either case - is probably a wise investment.