I tried this many times in the past with an electric mixer, but... ( `)
I thought that maybe the problem was that it mixed too quickly, so I tried using an immersion blender and found it to be super easy!
The first time, I used 1 tablespoon of vinegar, but 2 tablespoons makes it a little sour, which is how I like it.
If you add too much oil, it will solidify.

If you use an immersion blender, your kids can help make it.
It's rather obvious, but when blending, you must use a wide-mouthed jar. Recipe by Kenkenchin