I like a Big Mac also George.
Apart from Ketchup condiments, the ingredients MCD's use are unique to the product, so its difficult to recreate.
The bun itself has a flavour of its own, which you cant buy anywhere.
Chopped fresh onion will kill it stone dead also. Needs to be dried & rehydrated onion, also of a certain type. Same applies to the gherkins/pickles.
These are by far the best I've found
http://www.hengstenberg.de/site/rh.php#!/en/products/gherkins/Burger_Gherkins_slicedThe burger is probably the easiest bit
This recipe has been around for ages & is pretty good
Big Mac Special Sauce:
2 tablespoons KRAFT Miracle Whip
2 tablespoons cup mayonnaise
2 heaped tablespoons, French salad dressing
2 teaspoons, dill pickle relish (Heinz dill relish works)
1/2 tablespoon HEINZ sweet relish
1 teaspoon sugar
1 teaspoon ketchup
1 teaspoon white vinegar
1/8 teaspoon salt
1 teaspoon dried, minced onion
ELW