Ingredients

1 1/2 teaspoons finely grated lemon zest, plus 3 tablespoons fresh lemon juice

2 garlic cloves, finely grated

1 tablespoon chopped fresh oregano

2 tablespoons extra-virgin olive oil

Coarse salt and freshly ground pepper

1 pound boneless, skinless chicken breast halves, cut into 2-inch cubes

1/2 English cucumber, chopped

1/2 cup fat-free Greek yogurt

3 plum tomatoes, quartered

1/2 small red onion, cut 3/4 inch thick, and separated into slices

4 whole-wheat pitas

Garnish: oregano leaves

Preparation

Whisk together lemon zest, 1 tablespoon plus 1 1/2 teaspoons lemon juice, half the garlic, the oregano, 1 tablespoon plus 1 teaspoon oil, and 1/2 teaspoon salt. Add chicken, and toss to coat. Refrigerate, covered, for 45 minutes.

Meanwhile, stir together remaining lemon juice and garlic, the cucumber, yogurt, and 1/4 teaspoon salt. Refrigerate, covered, until ready to serve.

Heat grill to medium-high. Thread chicken, tomatoes, and onion onto 4 metal skewers. Brush with remaining 2 teaspoons oil, and season with pepper.

Grill skewers, turning, until browned on all sides and cooked through, about 8 minutes. Grill pitas until charred, about 2 minutes per side.

Serve skewers with charred pitas and cucumber-yogurt sauce. Garnish with oregano leaves.