Greek Chicken Kebabs

Name: Greek Chicken Kebabs
Prep time: 40 min
Total time: 1 h 10 min
Yield: 4 - 6 serving(s)
Ingredients: 1 seedless cucumber; 2 c. plain Greek yogurt; 1/4 c. fresh dill, chopped; Grated zest of 1 lemon, plus 2 tablespoons lemon juice; 1 small garlic clove, grated; Kosher salt and black pepper, to taste; 1 tbsp. garlic powder; 1 tbsp. lemon-pepper seasoning; 2 tsp. fennel seeds, crushed; 2 tsp. dried oregano; 1 1/2 tsp. kosher salt; 1/4 c. vegetable oil; 6 skinless, boneless chicken thighs (about 2 1/4 pounds), cut into thirds; 1 1/2 sweet onions, cut into wedges; 1 large zucchini, thickly sliced; 4 to 6 pieces pita bread, cut into quarters