the type of white vinegar used is porduced by a company called borges. here in the united states the borges family sells their vinegar, olive oil, olives and capers under the brand name of "star." if you look in a good quality super market you'll find it. the name it actually appears under is "star: italian kitchen." however if you have a look at the label you will see written, "product of spain." sherry vinegar is good to use, but i tend to reserve that for gazpacho and salmorejo as it is quite strong.