I’ve heard that McDonald’s calls certain drinks “shakes” and not “milkshakes” because they don’t contain enough milk to be considered milkshakes per government regulations.
This whole thing sounds crazy. Just saying, I’m not surprised if there are official definitions as to what is in mayonnaise.
Ask Debbie Wasserman-Schulz about this. She should know.
I used to work for McDonalds centuries ago when I was 14-16. Back then there was a super huge stainless steel container (I’m guessing at least 100 gallons or more) that we called the “Cow”......the shake mix was pumped in from a truck. I believe there was actually milk in it, but could be wrong. The Shake machine was filled with buckets tapped off from the “Cow”.