It's the exact way we prepare in Argentina. Maybe as you say due to Argentina being populated by spaniards and italians. It's really great to accompany meats like asado.
I made this several months ago and loved it! This is great as an antipasto served on a slice of crusty Italian bread. I halved the recipe and used white wine vinegar instead (that is all I had on hand). This really turned out fabulous and it was quick and easy to prepare. Thanks for sharing this wonderful recipe!