How long should you cook lamb steaks? I saw some posts about lamb. but they were related to lamb leg steaks, etc. 

Any way, how long should i grill these lamb steaks? 

I want them to be a medium? Or should they be served rare (i'm not sure how they're typically served in restaurants) ?  

They're about 1/2" thick and they're  (two) both about 0.7 lbs each.
I think they usually make them medium at the restaurants, but you could get rare if you like.

Anyway, with a .7 pound lamb, you could probably warm the oven up at 120C for 10 minutes, then put in the lamb, and turn the thermometer up to 180C for round about half an hour, and it should done to a turn.

Leastways, that's what I did.