In modern Greece, souvlaki is usually made with pork, but at Greek restaurants here in the United States, boneless, skinless chicken breast is common. Souvlaki may be served with rice and cooked vegetables or a salad, or on a lightly grilled pita, slathered with a yogurt-based tzatziki sauce, wrapped snugly, and eaten out of hand. This is our favorite way to eat souvlaki: The creamy sauce, freshened with herbs and cucumber, complements the char of the chicken, and the soft pita pulls it all together.