>>4591 (OP)
You're probably trolling, but it works like this. Back in the 1950s in the US there was a fad for French cuisine. A number of companies came up with instant French onion soup that was dehydrated onions and dehydrated beef stock and salt and spices. I want to say Lipton's was the first to market but it wasn't the only brand for long. Inside the carton it came in little foil packets, like it still does today.
And it was sold with recipes, because the marketing people thought people would buy more of it if you could use it for more than making soup. My mom mixed it into hamburger patties, for example. One of the most popular recipes, though, was one where you mixed the packet of instant soup into sour cream and let it stand a few hours in the fridge for the soup mix to absorb a bit of moisture from the sour cream. Then you're supposed to put a little parsley on top and serve it with crackers or chips. Lipton at first called it "California style onion dip" but it was eventually renamed "French onion dip" to cash in on that French food fad I mentioned. It was yuge. It was so yuge that soon they were selling it pre-made in plastic tubs in the dairy section. It was pretty popular. Maybe it wasn't quite as popular as ranch dressing is now, but they sold an awful lot of it. They still do.
It's about as French as french fries, but that doesn't stop people from calling it that, or eating it.