Originally Posted by AntonMG

Hey,

Taste wise, it's pretty close to French mayonnaise.
I would take the french recipe (whisk method):
Classic Mayonnaise Recipes | Ricardo

To be as close to the taste as humanly possible without all the chem stuff, I would prefer the White wine vinegar, cut down on pepper, replace the dry mustard with half the quantity of Dijon mustard.
Maybe add a pinch of sugar at the end (because let's face it, there's always sugar somewhere in a Macdonald's recipe).

You should be pretty much there.

Originally Posted by PR_Glen

they just use regular mayo.

beat eggs and add in oil SLOWLY as you mix, just a bit at a time. don't add salt or vinegar until the end or it wont set right. (oh and don't forget to add in salt and vinegar or it tastes like nothing)