Freeze as many bottom buns as you are making burgers. These will become the "middle bun" (if you can't find double decker buns).
Mix ground beef with a little salt and pepper and form into patties. Cover and chill.
Chop onions and slice iceberg, and pickles. Prepare cheese.
After "middle buns" are slightly frozen, using a serrated bread knife, carefully thinly slice the bottom crust off to make it a"middle bun".
Toast the buns on the grill or under a broiler. Remember to flip the middle bun to get it toasted on both sides.
Cook burgers.
Assemble burgers placing a bit of sauce on the bottom bun and middle bun.
Add burgers on each bun with one of them having a slice of cheese on it.
Add lettuce, onions and pickles, and more sauce on the top burger.