Mix ingredients from black pepper to vinegar in a bowl. Add the chicken stripes and toss to coat well. Set aside for 15 minutes.
Drizzle the olive oil in a frying pan and add the chicken along with the marination. Cook the chicken till almost done.
Add in the chopped onion and tomato and toss well to coat in the stock. Cook till the chicken is well done and the stock is dried. Switch off and allow to cool slightly.
Slit the pita bread and spread one tbsp of tahina in each pita. Sprinkle some zaatar and a tbsp of parsley on top of each.
Divide the chicken mixture into three and spread onto the pitas. Sprinkle lettuce leaves as required.
Roll them tight and serve immediately with a simple salad!
Notes
You can play around the spices as per your taste. You can replace the tahinah with zaatar or garlic mayo, as per taste. You can even add French fries before rolling your shawarma.