The "one-cough vs. three-cough" trick for judging olive oil
There's an old way to size up a fresh olive oil. It is said that after taking a small sip, you can count how many times it makes you cough. One cough is fine, but three-cough oil is considered better.
The thinking behind it is that the pepper at the back of your throat is a compound called oleocanthal. So the burn isn't acidity or a flaw, but it can tell you two things: high polyphenols, the antioxidants everyone's after, and freshness, since oleocanthal fades as the oil ages.
Of course, it doesn't replace what a lab test can do. And it can be slightly misleading if you take it too seriously, considering the cultivar. A mild arbequina won't cough you out even when it's excellent. Everyone's throat is different too, but it's a quick, fun check on whether a bottle is alive or flat.
Have you ever tried it?