- In a glass or nonreactive bowl, combine the lemon juice, olive oil, vinegar, oregano, rosemary, salt and pepper.
- Add the lamb cubes to the bowl and marinate in the refrigerator for 30 minutes to an hour, or preferably overnight.
- Heat the grill or broiler. If using a gas or electric grill, set to high.
- Thread the lamb cubes onto skewers and cook on the grill or in the broiler for about 5 minutes on each side, basting with any extra marinade while cooking. Remove the meat from the skewers. Serve in pita bread with tzaziki sauce.