Homemade Greek Gyros (Kebabs)

Ingredients

For 8 servings

• 1 onion ((medium, roughly chopped))
• 1 lb ground beef
• 1 lb ground lamb
• 2 cloves garlic ((large, roughly chopped))
• 1 Tbsp marjoram ((dried))
• 1 Tbsp rosemary ((dried, or a small sprig of fresh, taken off the main stem))
• 2 tsp salt ((Kosher or sea salt))
• ½ tsp black pepper ((freshly ground))
• 1 cup tzatziki sauce ((printable recipe card below))
• 8 leaves lettuce ((butter or romaine))
• 16 slices tomatoes
• 8 slices sweet onion