1. Combine mustard, vinegar, oil, rosemary, garlic and salt. Place the lamb in a roasting or sheet pan with the ribs curving down; coat the tops with the mustard mixture. Allow to stand for 1 hr. at room temperature.
2. Roast the lamb at 450°F for 20 min. Remove from oven; cover with aluminum foil. Allow to sit for 15 min. Cut into individual ribs; serve with Minted Tomato Sauce (recipe follows) and prepared pesto sauce.
Minted Tomato Sauce:
1.In a food processor, combine garlic, water, oil, oregano, vinegar, tomatoes, lemon juice and mint; blend for 1 min.
* Recipe and image provided by the American Lamb Board