I love onions, but never tried a Vidalia. We have Walla Walla sweet onions out here and I suspect they’re pretty similar.

They’re similar enough that my aunt, who has lived in the PNW for ages, but grew up in the South, described Walla Wallas as “basically just like a Vidalia, but grown here”.

There’s nothing particularly special about the onion variety - it’s just a mild yellow onion. It’s the soil.