As soon as the oil container is opened, you should smell the scent of freshly cut grass and olives, giving a sensation of clean freshness.
Pour some oil into a small glass, hold it with one hand to warm it up and cover it with the other hand, so as to retain its aroma inside the glass. Gently move the glass to let the oil circulate inside it.
When it is as warm as your hand, uncover the glass and inhale deeply. You should distinctly perceive the previously-described aromas, which can range from quite subtle and delicate to very intense.
Take a small sip of oil and keep it inside your mouth. Inhale vigorously with your teeth clenched at least three times, letting the air pass inside your cheeks towards your back teeth.
You should perceive a more or less accentuated combination of bitter and spicy tastes.
This bitter and spicy impression is not a defect, as many people mistakenly believe. Instead it indicates the presence of a high number of polyphenols (antioxidants), which allow the oil to maintain its excellent qualities and to be stored for a long time.