http://www.nytimes.com/2010/12/22/di...2mini.html?hpw
I have never encountered lamb "ribs" but here is Mark Bitman's recipe for a roasted rack of lamb. I made it for New Year's Eve last year and it was fantastic! Don't see why the seasonings and general method would not work with your lamb.
If you really have ribs, and not chops, you might need a slower cooking method, Google can be your friend. Look for recipes from known sources - NYT, Gourmet, Bon Appetit, Alton Brown to get an idea for appropriate cooking methods for your particular cut of meat. If you just google "lamb ribs" you'll get way too many bizarre hits to be worth looking at.
Old school cooked lamb until it was gray and dried out. Now most people will cook it to about 125-140o, or still pink but not bloody inside.
Garlic, rosemary, salt, shallots, & parsley make another good combination for lamb.