Take chicken in a bowl, add salt, pepper, chilli powder, cumin powder, coriander powder, salt, lemon juice or vinegar, garlic sauce in a bowl and mix well. Leave to marinate for 2 hours.
Preheat oven to 250 degree C to grill mode. Grease a baking tray with oil.
Arrange chicken in the tray and grill the chicken for 30 to 40 mins.
Remove the chicken halfway, spoon the juice over the chicken and continue baking.
Remove it and cut it into small pieces.
Take lettuce, onion, carrot in a bowl. Add salt, sugar, vinegar and mix well.
Add in chicken, garlic sauce and toss well.
Spoon this over pita bread and roll it out.