There's literally a nebula out there that is almost pure ethanol that tastes of raspberry. I've no clue how we figured out what it would taste like, but there is literally enough alcohol there to keep the next 500 generations of humans perpetually shit faced even with the population boom that would occur.
Infrared light gets absorbed by organic molecules at specific wavelengths depending on what structure they have. So we can look at IR light that has passed through the nebula to see what molecules are in it. The first article I saw said the cloud has ethyl formate which apparently has a raspberry like flavor.