I guess it depends if you would believe it. For me, taking an extremely small bite from a friends dish or observing people eating it while describing their experience could do it. I would be able to fill the details from analogous experience.

Maybe just imagining the experience does it too? I would intellectually know that I never aten it but I would be sure that I know how it is due to having experienced other fish and I can simply adjust the analogous experience to match the details I know about the experience I imagine having. This way I would be able to extrapolate details as if I had it for real.