A triple decker sandwich is a type of sandwich that is made with 3 slices of bread and also 2 layers of fillings.
The 3 slices of bread and 2 layers of fillings create a tall, multi layered sandwich which is more substantial than a normal or standard 2 slice sandwich.
A classic example of a triple decker sandwich is a triple decker club sandwich.
A triple decker club sandwich often features layers of turkey, bacon, lettuce and tomatoes between the 3 slices of toast.
3 slices of bread is the defining feature of a triple decker sandwich, and the additional slice of bread creates a middle layer, making the sandwich a triple decker sandwich.
There are also 2 distinct layers of ingredients that are sandwiched between the 3 slices of bread on a triple decker sandwich.
Triple decker sandwiches can also be made using a wide range of fillings, which include different ingredients like bacon, ham, chicken, turkey and vegetables like onions, tomatoes, lettuce and even cheeses.
Toothpicks are also often sued to hold the 3 layers of bread in place on a triple decker sandwich and keep the triple decker sandwich from falling apart when you slice the triple decker sandwich.
You can make triple decker sandwiches with any type of ingredients you would like.