Marinated Chicken Kebabs with Lemon Pepper Yogurt Sauce

Name: Marinated Chicken Kebabs with Lemon Pepper Yogurt Sauce
Ingredients: 2 cups extra-virgin olive oil; Juice of 3 lemons; 2 tablespoons chopped garlic; 3/4 tablespoons chopped fresh rosemary leaves (about 4 sprigs); 3/4 tablespoons fresh thyme leaves (about 5 sprigs); 6 single boneless, skinless chicken breasts, cleaned of fat and cut into large cubes; Salt and black pepper to taste; Bamboo skewers; 2 (7-ounce) containers plain yogurt; 4 tablespoons sour cream; 3 tablespoons red wine vinegar; Zest of 2 lemons (fine); Juice of 1 lemon; 2 tablespoons minced garlic; 1 tablespoon black pepper; 2 teaspoons salt; 1/2 cup fresh mint, chopped (optional)