Prepare the Meat Mixture: In a large bowl, combine the ground beef or lamb with grated onion, garlic, yogurt, tomato paste, salt, pepper, paprika, cumin, oregano, and olive oil. Mix thoroughly until the mixture is sticky and well-blended.

Form the Meat Sheet: Divide the mixture into five equal portions. Roll each portion into a thin rectangle, about 1/2 inch thick on parchment paper.

Roll It Up: Peel back the top layer of parchment and roll the meat into a log shape using the bottom parchment.

Bake: Preheat oven to 200°C (400°F). Place rolled meat logs on a baking sheet and bake for 20-25 minutes until golden and internal temperature reaches 70°C (160°F).

Slice: Once baked, allow meat logs to rest for 5 minutes. Slice thinly using sharp forks for authentic texture.

Assemble: Warm pita or tortillas, stuff with sliced meat, shredded lettuce, sliced onion, and pickles. Drizzle with tahini or tzatziki if desired.