Cabernet Sauvignon is one of the (if not the) most widely planted black grape varieties. In the glass it is readily recognisable due to its pronounced aromas and flavours of blackcurrant, often alongside notes of mint or menthol. The grapes are small, with thick skins, and so produce wines that are deeply coloured and can be highly tannic. It has great ageing potential and is a key component in the wines of Bordeaux.
Genetically, it is a cross between Sauvignon Blanc and Cabernet Franc. Read more in Everything You Need to Know About Cabernet Sauvignon.