1 In a shallow glass or ceramic dish, whisk together the lime juice, honey, oregano, allspice, ginger, salt, and pepper.
Add the lamb, turning it several times to coat; cover with plastic food wrap and refrigerate for at least 3 hours or overnight.
2 Preheat the oven to 375° F Fold the 2 halves of the lambtogetherand tie with string at 1 1/2-inch intervals.
Place the lamb in a small roasting pan and roast, brushing occasionally with the marinade, for 35 minutes for rare or until the meat thermometer registers 140° F For lamb that is medium, roast for 42 minutes or until the meat thermometer registers 150° F For lamb that is well-done, roast for 50 minutes or until the meat thermometer registers 170° F Let the roast stand for 15 minutes before carving.