Chicken Gyros with Tzatziki Recipe

Ingredients

• Pickled Red Onions (makes 2 cups)
• 3 cups thinly sliced red onion (1 medium onion, 10 to 12 ounces)
• ¾ cup white vinegar
• ¼ cup sugar
• 2 teaspoons kosher salt
• Tzatziki
• 1 cup peeled, grated English cucumber (about ½ large cucumber)
• 1 small garlic clove, grated
• 2 tablespoons fresh lemon juice
• 1 cup full-fat Greek yogurt
• 1 tablespoon extra-virgin olive oil
• 2 tablespoons fresh dill, plus more for serving
• ½ teaspoon kosher salt
• Chicken Gyros
• 2 large chicken breasts (1 to 1½ pounds), cut in half horizontally and cubed
• 2 teaspoons dried oregano
• 1 teaspoon kosher salt
• ½ teaspoon freshly ground black pepper
• ¼ cup minced onion
• 2 garlic cloves, minced
• 4 pita
• 1 romaine heart, chopped
• 1 cup English cucumber, sliced into half-moons
• 1 cup cherry tomatoes, quartered
• Pickled red onions or 1 handful sliced red onion