In a food processor or by hand using a box grater, finely shred or grate the onion
Add the beef, spices and yogurt and blend until well combined (if you used a box grater for the onion, you can add the ingredients to a mixing bowl and mix by hand)
Preheat oven to 400°F and prepare 8 large sheets of parchment paper
Divide beef mixture equally among 4 sheets of the parchment paper
Using a second sheet of parchment paper and a rolling pin (or by hand), press the beef flat and roll until very thin and almost the full size of the parchment paper
Starting from one end, fold parchment tightly into rolls and place on a medium baking sheet
Bake for 10 minutes, then remove from the oven and drain the fat on the baking sheet
Return to the oven and bake for 10 more minutes
Carefully unroll the parchment paper sheets and lay out the beef
Broil for 1-2 minutes until crispy and lightly charred
Chop or tear into smaller pieces of desired size