Question: how long to cook 2 rib of beef?
Answer: Season the joint with the crushed pepper and sea salt or a flavouring of your choice. ... 
Roast for 20 minutes at 220C/fan 200C/gas 7, then turn the oven down to 160C/fan 140C/gas 3.
Cook for 20 minutes per 450g for medium/15 minutes per 450g for rare. ... 
Slice the meat neatly away from the bone.