Place it on a chopping board and flatten it with a rolling pin..

In a separate bowl mix the mayonnaise and ketchup..they'll serve as the sauce.

With a spoon fetch the sauce and spread it out on the bread..Arrange your already diced tomatoes, onions, egg, chicken, cucumber etc

Gently fold it in a cone. If you have some lemon grass, you can use a strip out of its leaf and make a knot at the center of your already folded bread sandwich..