This sherry vinegar Reserva vintage, comes from the slow mutation in oak barrels of wines from Sherry province in the South of Andalusia in Spain. It has an aroma of cooked wines and dry wood.
 
This vinegar is powerful with a taste of walnut and Madeira which tastes wonderful with walnut oil for mixed salads. It is also ideal for veals liver or for white meat sauces. 
 
I personally use this vinegar and think it is wonderful.

Note: label on actual product differs from one in photo.