That's acidity, particularly when encounter it with a sides within the tongue. As we've suggested, a little knowledge goes some way, and, for some us, it's all we need so that you can fully enjoy our wine experience. Another approach is to try poaching the fish in the saucepan of wine. https://squareblogs.net/beastzipper6/a-wine-lovers-nearly-weekly-analysis-15-wine-an-austrian-gruener-veltliner