Thoroughly combine all ingredients, except the lamb and grapes. Coat the meat evenly with mixture. Cover and marinate in the refrigerator for at least 2 hours. Remove from the refrigerator 30 minutes before grilling.
Light a fire in a charcoal or gas grill. Soak 8 bamboo skewers in enough water to cover for 30 minutes. Drain.
Thread 3 pieces of meat and 4 grapes on each skewer. Grill 2 to 3 minutes on each side, or until medium-rare. Season with salt.
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