Madeira - A fortified wine from the island of Madeira which belongs to Portugal but is located off the west African coast. Historically famous, the wine drunk by the founding fathers of the United States to toast the signing of the Declaration of Independence is reported to have been Madeira. The very best Madeiras are made from four white grapes: sercial, verdelho, bual, and malmsey, which give the four styles of Madeira their names. Thus, starting with the driest style and moving to the sweetest, the styles of Madeira are sercial, verdelho, bual, and malmsey. Madeira's toffee-caramel-like character comes as a result of heating the wine, a process called estufagem. This is either carried out naturally (the wine is left in hot attics for up to 20 years) or the wine is placed in containers that are then heated to an average temperature of 105таF for three to six months.