Pita bread Shawarma

Name: Pita bread Shawarma
Ingredients: 4 pita bread; 2 chopped medium tomato; 1 chpped medium shimla mirch; 1/2 chopped Cabbage of small sized; 1/2 kg chicken boneless; for margination :; 1 tsp red chilli powder; 1 tsp garammasala powder; 1 tbsp oil; 2 tbsp dahi; 1 tbsp lehsan adrak paste; 1 tbsp sirka; 1 tbsp soy sauce; 1/2 tsp black pepper powder; to taste Salt; 1/2 tsp haldi powder; 2 tbsp oil; for sauce :; 4 tbsp ketchup; 6 tbsp mayonnaise; 1/4 tsp black pepper powder; 1 tsp sugar; 1/2 tsp sirka; pinch salt