I think a lamb roast, lightly seasoned before roasting, is one of the finest meals you can get. The flavor of the meat is exceptional, and you really owe it to yourself to try it if you can.

Costco sells lamb roasts for a reasonable price. This looks like a pretty decent recipe, although I never make sauce for my lamb--it's certainly juicy enough as-is: http://www.foodnetwork.com/recipes/emeril-lagasse/rosemary-a...

Another great use for the Costco lamb: cube it, marinade it in French dressing for a few hours, then make kebabs alternating the lamb cubes, chunks of bacon, and pineapple pieces. Cook it on the grill, it's fantastic.