The origin of Cognac
Unique conditions of climate, terrain, proximity to the sea make the Delimited Cognac Region a "happy chance of nature". Its vineyard counts approximately 80000 hectares, distributed between the departments of Charente and Charente-Maritime, to which are added two enclaves in Deux-Sèvres and Dordogne. It consists of white grape varieties: UGNI WHITE, WHITE FOLLY, COLOMBARD, for the main ones.
The creation of the vineyard of Saintonge probably dates from the end of the 3rd century thanks to the Roman emperor Probus who extended then to all Gauls the privilege to have vineyards and make wine. In the thirteenth century, a large vineyard, built around La Rochelle, produced wines appreciated by the inhabitants of the countries bordering the North Sea. It was therefore from the Middle Ages that appeared in the Charente basin conditions conducive to trade. After the salt trade, the cultivation of the vine would become the basis of the Charente's economy.
Acids and low degree, the wines from this region suffered long voyages at sea. In the 17th century, the Dutch and English merchants found it more advantageous to import the product of the vineyards of Saintonge, Aunis and Angoumois in the form of brandy, representing a reduced volume, less expensive to transport. Added with water, this product took the name of "brandwijn" (wine burnt) .After economic crises, stocks of eaux de vie remained unsold. It became clear that they improved with age and could be consumed pure.
Cognac was born.
Making Cognac
Grapes
The white wine used in making cognac is very dry, acidic and thin. Though it has been characterized as "virtually undrinkable », it is excellent for distillation and aging. It may be made only from a strict list of grape varieties. In order for it to be considered a true cru, the wine must be at least 90% Ugni blanc (known in Italy as Trebbiano), Folle blanche and Colombard, while up to 10% of the grapes used can be Folignan, Jurançon blanc, Meslier Saint-François (also called Blanc Ramé), Sélect, Montils or Sémillon. Cognacs which are not to carry the name of a cru are freer in the allowed grape varieties, needing at least 90% Colombard, Folle blanche, Jurançon blanc, Meslier Saint-François, Montils, Sémillon, or Ugni blanc, and up to 10% Folignan or Sélect.
Fermentation & distillation
After the grapes are pressed, the juice is left to ferment for two or three weeks, with the region's native, wild yeasts converting the sugar into alcohol; neither sugar nor sulfur may be added. At this point, the resulting wine is about 7% to 8% alcohol.
Distillation takes place in traditionally shaped Charentais copper alembics stills, the design and dimensions of which are also legally controlled. Two distillations must be carried out; the resulting eau-de-vie is a colourless spirit of about 70% alcohol.
Ageing
Once distillation is complete, it must be aged in Limousin oak casks for at least two years before it can be sold to the public. It is typically put into casks at an alcohol by volume strength of about 70%. As the cognac interacts with the oak barrel and the air, it evaporates at the rate of about three percent each year, slowly losing both alcohol and water. This phenomenon is called locally "La part des anges", or "The angels' share". Because the alcohol dissipates faster than the water, the alcohol concentration drops to about 40% over time. The cognac is then transferred to large glass carboys called bonbonnes, then stored for future blending. Since oak barrels stop contributing to flavor after four or five decades, longer aging periods may not be beneficial.
Blending
The age of the cognac is calculated as that of the youngest component used in the blend. The blend is usually of different ages and (in the case of the larger and more commercial producers) from different local areas. This blending, or marriage, of different eaux-de-vie is important to obtain a complexity of flavours absent from an eau-de-vie from a single distillery or vineyard. Each cognac house has a master taster (maître de chai), who is responsible for blending the spirits, so that cognac produced by a company will have a consistent house style and quality. In this respect it is similar to the process of blending whisky or non-vintage Champagne to achieve a consistent brand flavor. A very small number of producers, such as Guillon Painturaud and Moyet, do not blend their final product from different ages of eaux-de-vie and therefore produce a "purer" flavour (a practice roughly equivalent to the production of single malt Scotch whisky). Hundreds of vineyards in the Cognac AOC region sell their own cognac. 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. Depending on their success in marketing, small producers may sell a larger or smaller proportion of their product to individual buyers, wine dealers, bars and restaurants, the remainder being acquired by larger cognac houses for blending. The success of artisanal cognacs has encouraged some larger industrial-scale producers to produce single-vineyard cognacs.
Source : wikipedia.org