I picked up some organic boneless cross rib steak, on sale... I don't know how to cook it.

I tried pan searing one this morning, and it was tough and tasteless. I seasoned it with salt and pepper, and cooked it pretty rare - I don't know, the juiciness was nice but it was chewy and hard to slice and yeah, tough and blah. I could only eat half of the 220g piece.

I don't want to wreck the next one! Any tips?

(I'm an ex-vegetarian and haven't cooked meat in YEARS.)

Also, why is it okay to eat rare, bloody red steak but ground beef I'm supposed to cook through?