In USSR when I grew up, it was a common folk remedy (which seemed to work) to use raspberry jam (usually with tea) as fever reducer.
Specifically, it caused you to sweat a lot, not sure if that was supposed to be a side effect or an actual mechanism of lowering the fever, but the heavy sweating followed by reduced fever seemed to work at least in my anecdotal case pretty reliably.
This still seems to be a common belief.
Is there any research proving or disproving that?