There are different grades of cognac depending on the age of the blends used. VS, VSOP, XO, Paradis, Richard and Ellipse are the 6 types of Hennessy cognac.
A Cognac.
Hennessy is a cognac house. It's part of the Louis Vuitton Moet Hennessy Group and currently the world's largest Cognac producer. Sources: http://en.wikipedia.org/wiki/Hennessy/ http://www.cognac-expert.com/cognac-brands/hennessy-cognac
Hennessy is a cognac. Cognac is made from grapes.
Black Hennessy is type of cognac which is an alcoholic beverage.
Hennessy Cognac distillery was founded in the year 1765 by Irishman Richard Hennessy. Since then the brand has grown into a worldwide leader in the beer industry.
For Cooking you can use any affordable VS Cognac. E.g a Hennessy VS or even younger. Often available are the Hennessy VS Very Special Cognac. 40 different eaux-de-vie in this blend, some of them aged up to 8 years. Another Option would be the Rémy Martin VS which isn't distributed everywhere, and it used to be called "Grand Cru". Rémy Martin's Very Special is a pure Petite Champagne blend.
hennessy or martell
YES
Lorenzo C Brown
Hennessy is a brand name of Cognac.
Actually this cognac is a blend of some crus: Grande Champagne, Petite Champagne, Borderies and Fin Bois. However, you can buy this cognac for approx. $235, e.g. here http://www.cognac-expert.com/xo-cognac/hennessy-xo-cognac-extra-old