Chicken Shawarma

Name: Chicken Shawarma
Ingredients: 1 Cup Malt Vinegar; 1 Cup Plain yogurt; 1 Table Spoon Vegetable oil; 1 As Required Salt; 1 As Required Pepper; 1 Table Spoon Mixed spice; 1 Table Spoon Ground Cardamom; 8 Pieces Boneless Chicken Thighs; 1 Cup Tahini; 1 Table Spoon Minced garlic; 2 Table Spoon Lemon juice; 1 Table Spoon Olive oil; 1 Table Spoon Fresh Parsley, chopped; 4 Medium Tomatoes (thinly sliced); 1 Cup Sliced onion; 4 Cup Shredded lettuce; 8 Pieces Pita bread rounds