A form of pyrazine (methoxypyrazine, to be exact) is found on the skins of grapes, which can heavy influence the flavour profile of resultant wines if the fruitsca n't completely to ripen.
A form of pyrazine (methoxypyrazine, to be exact) is found on the skins of grapes, which can heavily influence the flavour profile of resultant wines if the fruit is unable to ripen fully.