Traditional Gyros

Ingredients

• 1 small onion, cut into chunks
• 1 pound ground lamb
• 1 pound ground beef
• 1 tablespoon minced garlic
• 1 teaspoon dried oregano
• 1 teaspoon ground cumin
• 1 teaspoon dried marjoram
• 1 teaspoon dried thyme
• 1 teaspoon dried rosemary
• 1 teaspoon freshly ground black pepper
• 1/4 teaspoon sea salt
• boiling water as needed
• 12 tablespoons hummus
• 12 pita bread rounds
• 1 small head lettuce, shredded
• 1 large tomato, sliced
• 1 large red onion, sliced
• 6 ounces crumbled feta cheese
• 24 tablespoons tzatziki sauce