In the past, the must was emptied into barrels or vats where, as a general rule, it fermented for about two months. When fermentation finished the wines were separated from the dregs and transferred to other casks, to be aged in either the “estufa” or “canteiro” method. Up until the mid 18th century, the making of the wine consisted of these steps and then subsequent blending with older wine. But from this period onwards, the process of mixing the wine with aguardente became common.