Greek Chicken Kebabs with Tzatziki Sauce

Name: Greek Chicken Kebabs with Tzatziki Sauce
Prep time: 20 min
Total time: 20 min
Cuisine: European, Mediterranean, Greek
Ingredients: ⅓ cup olive oil or avocado oil; ¼ cup lemon juice; 1 tsp. lemon zest; 1 Tbsp. apple cider vinegar; 2 Tbsp. fresh oregano leaves, chopped (or 2 tsp. dried); 4 garlic cloves, finely minced; ½ tsp. sea salt; ½ tsp. black pepper; ¼ tsp. red pepper flakes; 1 ½ lbs. chicken breasts (~3-4 breast), cut into 2-inch pieces; 1 medium zucchini, sliced ½ inch thick rounds (half moons if large); 1 large sweet bell pepper, cut into 1 to 1 ½ inch squares; 1 medium red onion, cut into 1 to 1 ½ inch squares; 6-8 skewers (for wooden skewers soak in water for 30-minutes before assembling kebabs); ½ cup grated English cucumber, squeezed to remove water*; ½ cup plain Greek yogurt; 1 ½ Tbsp. lemon juice; 1 Tbsp. olive oil or avocado oil; 1 Tbsp. fresh dill (or 1 tsp. dried); 2 garlic cloves, minced; ¼ tsp. sea salt; ¼ tsp. black pepper