Sea Salt to taste - we like a good extra 1/4 or so tsp of sea salt!
Whisk everything in a shallow bowl good for dipping bread!
Olive oil sourcing does matter. If you are in the USA, look for the COOC label to ensure your olive oil isn't cut with other cheap oils. We like the Bari Organic Olive Oil which is available at most grocers now. Recently, California Olive Ranch Olive Oil, which I have used up until a few months ago, lost their seal and I cannot trust their process right now. I have recommended them in the past and do not at this time.