Describing the flavors of Chardonnay is not easy. While many Chardonnay wines have high aromatic complexity, this is usually due to winemaking techniques (particularly the use of oak) rather than the variety's intrinsic qualities. Malolactic fermentation gives distinctive buttery aromas. Fermentation and/or maturation in oak barrels contributes notes of vanilla, smoke and hints of sweet spices such as clove and cinnamon. Extended lees contact while in barrel imparts biscuity, doughy flavors. Because of this high level of winemaker involvement, Chardonnay has become known as the "winemaker's wine".