While the chicken is marinating, let’s talk about the tzatziki sauce—because what’s a gyro without that creamy, cool sauce? It’s so easy to make. Simply combine the Greek yogurt, grated cucumber, garlic, lemon juice, olive oil, and dill in a bowl. Give it a good stir, and season with a little salt and pepper to taste. I love how refreshing this sauce is, and it really adds that authentic Greek flavor to your gyros.