Disassemble the Big Macs by removing the cheese-coated patties from the bun and separate out the pickles, special sauce, and lettuce. Chop the cheese-coated patties into large chunks and set aside. Chop the buns into large chunks and toast them for 1 to 2 minutes until slightly golden brown.
Place the fries in a fry boat or a shallow bowl. Top with the chopped up patties, the special sauce, lettuce, and pickles. Garnish with diced onion and extra pickle slices, if desired. Add a few pieces of toasted bun on top.