Yogurt Braised Leg of Lamb

Name: Yogurt Braised Leg of Lamb
Ingredients: 3 1/2 pounds of lamb (deboned and cut in 1-inch pieces); 4 tablespoons olive oil; 2 large onions, peeled and cut into medium dice; 2 large garlic cloves, peeled and sliced; 4 medium carrots, peeled and sliced on the bias; 3 bay leaves; 1/4 cup dried oregano, crushed; 2 tablespoons black pepper freshly ground; 4 large potatoes peeled, cut into medium dice; 2 tablespoons red wine vinegar; 1/2 cup lemon juice; 1 quart yogurt, strained*, reserve 4-ounces for garnish; 3 quarts water; Salt and pepper, to taste; Pita bread, optional