Spray 12 inch skillet with nonstick cooking spray. Mix ground beef, 1/3 cup yogurt, the shallots, parsley, salt and pepper. Shape into 24 meatballs, each about 1-1/2 inches. Cook meatballs in skillet over medium heat about 5 minutes or until light brown on all sides. Stir in tomato puree and mushrooms; turn meatballs to
coat with sauce.
Remove meatballs from skillet. Cool sauce 5 minutes; stir in 2/3 cup yogurt and the horseradish. Divide meatballs, lettuce, tomatoes and sauce among pita breads. 8 servings |