Greek Pita Sandwiches

Name: Greek Pita Sandwiches
Ingredients: 2 cloves garlic; One 7-ounce block feta; Two 5.3-ounce containers full-fat Greek yogurt; 2 tablespoons extra-virgin olive oil, plus more as needed; 1 tablespoon fresh lemon juice, or more as needed; 1 1/2 teaspoons sumac; 1/4 teaspoon kosher salt, or more as needed; Freshly cracked black pepper; 1 1/2 pounds 80/20 ground beef; 1/2 cup grated white onion; 3 tablespoons minced fresh parsley; 1 1/2 teaspoons garlic powder; 1 teaspoon ground cumin; 1 teaspoon kosher salt, or more as needed; 1/2 teaspoon ground cinnamon; 1/2 teaspoon freshly cracked black pepper, or more as needed; 2 to 3 tablespoons extra-virgin olive oil; 3 tablespoons extra-virgin olive oil; 2 tablespoons red wine vinegar; 1 teaspoon honey; 1/2 teaspoon Dijon mustard; Kosher salt and freshly cracked black pepper; 1 small English cucumber, small dice; 1 small head romaine, small dice; 1/2 small red onion, small dice; 1/4 cup minced fresh basil; 1/4 cup minced fresh dill; 1/4 cup minced fresh parsley; 5 pitas, warmed; 1 tablespoon olive oil