Lemongrass: Preparation and Aromatic Release

Lemongrass is native to South Asia and Southeast Asia and is cultivated throughout tropical regions worldwide. Its essential oil is one of the most widely used in the perfume industry — citral's lemon-lime-floral character is commercially extracted for cosmetics, cleaning products, and beverages. In Mekong cooking, it serves as a structural aromatic in pastes and a flavouring infusion in soups and broths.

Lemongrass (Cymbopogon citratus) contains its aromatic compounds — primarily citral (a combination of geranial and neral) — concentrated in the swollen lower third of the stalk and in the internal layers of that section. The outer sheath is fibrous and flavourless. The preparation method determines whether lemongrass delivers its aromatic potential: the fibrous sheath must be removed, the tender inner stalk exposed, and the aromatic compounds released through either bruising (for infusion) or fine slicing or pounding (for direct consumption).

Lemongrass's citral (a monoterpene aldehyde) is in the same aromatic family as lemon peel's limonene — both terpene compounds with bright, lemon-citrus registers. But where lemon peel's aroma is primarily from the skin's volatile surface oils, lemongrass's citral is concentrated inside the stalk and requires cell rupture to release. As Segnit would note, the combination of lemongrass + lime leaf + lime juice in a Thai preparation represents three different chemical expressions of citrus-adjacent terpenes — each amplifying the others' perceived citrus register while contributing distinct individual characters.