Take a nonstick saucepan and slightly grill slices of pastrami and split knockwurst in extra virgin olive oil on a medium-heat, for about 2 minutes.
In the same pan, slightly toast the freshly baked rye bread slices to give them a little crisp, toast each side for about 30 to 45 seconds on low-heat.
Take a small pan and place the bread pieces on it.
Place pastrami evenly on top of both toasted slices of rye bread.
Now lay down slices of Swiss cheese in a single layer atop pastrami.
Now put the split knockwurst long ways on top of the Swiss cheese.
Put the pan with the sandwich in a preheated hot oven for about 2 minutes or until the cheese melts. (preheat the oven at around 260° F)
Serve immediately with brown mustard and French fries on the side.