I tried this last night - it's lush! It's not the real thing by far, but close enough
Extra lean mince
Thousand Island dressing
Chopped onion
Sliced gherkin
Shredded iceberg lettuce
Salt/pepper to taste
(I added sliced cherry tomatoes too, for a bit of extra veg)
Fry the onion and mince, add the rest and whack it in a bowl!