
Sage leaves are the aromatic leaves of Salvia officinalis, a perennial evergreen subshrub in the mint family, used fresh or dried as a culinary herb.
Camphoraceous and savoury-herbal, carrying a warm, slightly medicinal, resinous aroma with an eucalyptus-like edge.
Contributing aroma more than flavour, the leaf works best bruised, muddled or infused rather than used raw, since whole raw leaves release comparatively little; a leaf or two is muddled or slapped as an aromatic accent and garnish. Concentrated sage extracts and oils contain thujone and should not be dosed like ordinary culinary quantities.
Where sage is a lone muddled leaf, garnish or minor accent, another woody Mediterranean herb of the same family is a tolerable swap; where sage is the drink's defining aroma, its specific camphor/thujone/cineole profile cannot be rebuilt from unrelated ingredients and it is effectively not substitutable.
Greek sage
Common sage (S. officinalis) always has simple leaves, whereas Greek sage (S. fruticosa) develops trifoliolate leaves at maturity yet is frequently sold in supermarkets as fresh 'sage', so what a buyer receives may not be true common sage.
Other Salvia species
The genus Salvia spans around 900 species and the name 'sage' is applied broadly; only culinary common sage carries the standard savoury sage flavour, and many ornamental sages such as pineapple sage or white sage are not used in cooking.
Sage leaves are oblong, grey-green, finely veined and covered in fine hairs, and highly aromatic. Their scent comes from an essential oil dominated by thujone, camphor and 1,8-cineole.
Fresh leaves are perishable; refrigerate and use within a few days, or use dried.
Salvia officinalis is native to the Mediterranean region and has a long history of culinary use in the Old World.