Hidalgo 'Wellington' Palo Cortado VOS 20 Year SherryPalo Cortado is unusual, in that it first ages under a film of yeast flor which protects it from oxygen, but then loses that flor to age oxidatively at the very end of the process. Thus, the freshness of Manzanilla and the complexity of dry Amontillado are combined. When aged over twenty years it is entitled to the designation VOS, (Very Old Sherry). This sherry was once sold to British troops under the name Wellington, and the 1st Duke of Wellingtons