I just came across the The Takeaway Secret, first 32 pages for free on the internet (not difficult to find with a quick search). Those first pages do contain the Big Mac & special sauce. Went out to buy the necessary French's brand mustard, iceberg, double bun, etc. and had my first attempt last night. Even before tasting, I knew this was a winner. Wow, almost exactly the same, I've never created anything like that before. I found the sauce a bit too mayonnaise-y, and the raw onion a bit overpowering, so I know what to adjust for attempt #2. It's really not hard if you follow the recipe to the letter. I'm amazed I can now replicate a Big Mac. The wife was impressed too, a bit depressed actually concidering the implications.
Fries next. Already well down the sugar no sugar debates.