Andrea's wine pick: The juicy acidity and rustic herbaceousness of a French red Côtes du Rhône will stand up to the mustardy tang of the herb crust. Look for Georges Duboeuf Côtes du Rhône 2004 ($7.99). Ask your butcher to "french" the bones for an attractive appearance. Cover bones with a strip of aluminum foil to prevent burning.
2 pounds red potatoes, cut into 1 1/2-inch chunks
2 tablespoons extra-virgin olive oil
3 tablespoons Dijon or stone-ground mustard
3 tablespoons chopped fresh rosemary, divided
1 tablespoon chopped fresh thyme
2 garlic cloves, minced
1 (1 1/2- to 2-pound) rack of lamb, trimmed
1 large onion, cut into thin wedges
3/4 teaspoon salt
1/4 teaspoon freshly ground black pepper
How to Make It
Preheat oven to 425°.
Toss potatoes with oil in a shallow roasting pan. Bake 15 minutes.
Meanwhile, combine mustard, 1 tablespoon rosemary, thyme, and garlic; spread over meaty side and ends of lamb rack.
Add onion wedges, remaining 2 tablespoons rosemary, salt, and pepper to potatoes; mix well. Push mixture to edges of pan; place lamb rack, meaty side up, in center. Bake 22 minutes or until internal temperature of lamb reaches 140° for medium-rare. Transfer rack to a carving board; tent with foil, and let stand 5 minutes (temperature will rise to 145°).
Transfer potato mixture to 4 warm plates. Cut lamb crosswise into 8 chops; transfer to plates and serve.