Gyro Stuffing

Name: Gyro Stuffing
Ingredients: 6 Tablespoons unsalted butter; 1 onion, finely chopped; 3 cloves garlic, minced; 1 Cup cherry tomatoes, chopped in half; 1 Tablespoon fresh oregano, chopped; 2 Teaspoons Greek seasoning; 1 Pound cooked gyro meat, cut into small strips; 2 Cups beef stock; 1/4 Teaspoon ground pepper; 1/4 Teaspoon salt; 6 pita loaves, cut into 1-inch squares; 1 egg, beaten; 1 Cup Greek yogurt; 1 small cucumber, peeled and diced; 2 Teaspoons chopped fresh dill; 2 Teaspoons lemon juice; 1 Teaspoon lemon zest; 1 clove garlic, minced