Lamb Gyros

Name: Lamb Gyros
Prep time: 10 min
Cook time: 1 h 10 min
Total time: 1 h 20 min
Cuisine: European, Mediterranean, Greek
Ingredients: 2 pounds ground lamb (or beef); 1 onion, cut into 8 pieces; 4 cloves garlic, grated/minced; 4 teaspoons salt (or to taste)*; 2 teaspoons pepper; 2 teaspoons dried oregano; 1 teaspoon dried rosemary; 1 teaspoon dried thyme; 1 teaspoon dried marjoram; 2 teaspoons ground cumin; 1/2 teaspoon cinnamon (optional); 8 pitas (gluten-free for gluten-free); 2 cups lettuce, sliced; 1 cup tomatoes, sliced; 1 cup cucumber, sliced; 1/2 cup tzatziki; 1/4 large red onion, thinly sliced; 1/4 cup feta, crumbled