SOUVLAKI :Chicken Kebab

Name: SOUVLAKI :Chicken Kebab
Ingredients: 3 tablespoons fresh lemon juice; 1 1/2 teaspoons chopped fresh or 1/2 teaspoon dried oregano; 2 teaspoons olive oil; 1/2 teaspoon salt; 4 garlic cloves, minced; 1/2 pound skinless, boneless chicken breast, cut into 1-inch pieces; 1 medium zucchini, quartered lengthwise and cut into (1/2-inch-thick) slices; Cooking spray; TZATZIKI SAUCE; 1/2 cup cucumber, peeled, seeded, and shredded; 1/2 cup plain non fat Greek yogurt; 1 tablespoon lemon juice; 1/4 teaspoon salt; 1 garlic clove, minced