This is the sandwich that I always order at delis. It's definitely a full meal.

Nex time you're at a deli -
Get a roast beef sandwich on a French roll.
Not everything on it - JUST yellow mustard and pickles.
With that, order Swiss cheese, and -
Here's the most important ingredient: You want potato salad INSIDE the sandwich. Just order a coat of it inside the bun. They may charge you extra for the potato salad - get about an eighth pound's worth if they ask.

And there you have it: The Fat Jeffrey. Best sandwich in the whole world ever.