Spicy Lamb Shish Kebabs With Greek Pita Bread

Name: Spicy Lamb Shish Kebabs With Greek Pita Bread
Ingredients: 1⁄4 cup fat-free plain Greek yogurt; 3⁄4 tablespoon hot paprika; 1 teaspoon ground cumin; 1⁄2 teaspoon ground allspice; 2 garlic cloves, minced; 1 tablespoon extra virgin olive oil, plus more for brushing; kosher salt & freshly ground black pepper; 2 lbs trimmed lean leg of lamb, cut into 1-inch cubes; 1 lb small zucchini, halved lengthwise and cut crosswise into 1-inch pieces; greek pita bread, warmed for serving