• Place a sheet pan with a cooling rack on it in an oven set to "keep warm".

To Make the Tzatziki Sauce

• In a medium bowl, combine the Greek yogurt, grated cucumber, minced garlic, lemon juice, salt, and pepper. Stir well. Taste and adjust seasoning if needed. Cover and refrigerate while you cook the lamb to let the flavors meld.

To Make the Gyro Pita Recipe

• Line a half sheet pan with parchment paper. Break up and scatter the ground lamb over the parchment paper. Sprinkle with the minced garlic, granulated garlic, dried oregano, dried marjoram (or additional oregano), kosher salt, black pepper, dried rosemary, thyme, cumin, baking soda, and cayenne pepper, if using. Gently toss all of this together to combine it evenly. You don't want to knead or mash it together, simply toss it.
• Divide the meat mixture into 6 equal sized balls.
• Preheat a griddle, cast-iron skillet, or stainless steel skillet over medium high heat. When a couple drops of water drizzled on the surface of the griddle or skillet sizzle and skitter, you're ready to go.
• Working with one ball of meat at a time, place the lamb in the center of the pan. Position a pita bread over the ball and use a heavy spatula to press down firmly on the lamb until it's about 1/4-1/2-inch thick. Cook for about 3 minutes, or until the lamb has a deeply caramelized crust and releases from the pan when you slide a spatula under it.

  Flip the lamb crusted pita over and cook the pita for about 3 minutes, lowering the heat if you need to to prevent the pita burning. If you prefer your lamb closer to medium or medium well or well done, add 1 to 2 minutes to the first side and cover with a dome while cooking the second side. Transfer to the pan in your oven, and repeat with the remaining lamb and pitas.

To Assemble and Serve the Gyro Pita Breads

• Top each gyro pita with thinly sliced red onion, sliced tomatoes or halved cherry tomatoes, crumbled feta cheese, a generous dollop or two of tzatziki sauce, and some torn lettuce, parsley, mint, and/or dill, as the spirit moves you.

To Store and Reheat Leftovers

• Store un-garnished gyro pitas between layers of parchment paper in a zipper top bag in the refrigerator or freezer. Reheat on parchment in a 350ºF oven or air fryer for about 5 minutes, or until heated through.