These are likewise blended from the eaux - de-vie of different years , but they are single - vineyard cognacs , varying slightly from year to year and according to the taste of the producer , .
Lacking some of the predictability of the better - known commercial products .
These are likewise blended from the eaux - de-vie of different years , but they are single - vineyard cognacs , varying slightly from year to year and according to the taste of the producer , hence lacking some of the predictability of the better - known commercial products .