But if it has jam in the middle of it......

Absolutely, Belligerent One!

I never knew anything but jam doughnuts (i.e. dough balls with raspberry jam in the middle) until I went on holiday to Canada around 1975. "Ring" doughnuts didn't get to the UK until about 10 years after that, as far as I'm aware. Accepted that my awareness can lack something sometimes

Curious, isn't it?