Slice the bread in half. Scoop out some of the bread.
Squirt submarine dressing on both the bottom and top of the bread and start layering ham, pastrami, cheese, onion, pepper. I usually give it another squirt of dressing and layer again - ending with cheese.
Wrap in saran wrap or the wrapper it came in and place on dinner plate with another dinner plate on top - squishing it together.
It's best to refrigerate overnight!
I generally cut the ham, pastrami, and cheese in half before layering!