Peppermint

Peppermint is a natural neurological hack. It contains massive levels of menthol, a molecule that chemically binds to the TRPM8 receptors on the tongue (the same ones that detect cold), sending the brain an illusory thermal signal of freezing. Because its leaves oxidize at lightning speed upon contact with air, flash infusion is preferred. Steeped for a few minutes in a boiling broth or syrup, its essential oils are extracted without releasing the leaf's bitter tannins.