Thinly slice beef and marinate for at least 1 hour in fridge in oil, sugar, cinnamon, salt and pepper. Prepare fresh veges. Cook meat in a wok for 5-7 minutes, or until cooked through**. Heat pita's in the oven on medium temp until warm through. Fill with hot meat and salad, spoon over sauce. And eat immediately. SAUCE: Mix yoghurt, sour cream, and finely chopped garlic and refridgerate until well chilled. ** Add some red and green pepper thinly sliced to the cooking meat as an optional extra.