Lemongrass

What it is

The fibrous, fragrant stalk of Cymbopogon citratus (and C. flexuosus), a tropical grass. The usable part is the pale, tightly layered bulbous lower stalk; the tough green upper blades are aromatic but woody. Sold as whole stalks, frozen, minced (frozen/jarred), or dried.

How it's made

Grown as a clumping grass and cut at the base. The entire stalk is usable if you know how: the tender lower 4–6 inches are bruised, sliced thin, or pounded into pastes; the tough fibrous tops are bruised whole and added to simmer (then removed, like a bay leaf) to perfume broths. Frozen lemongrass keeps the aroma far better than dried, which fades badly.

Flavor profile

Bright, clean, citrusy-lemon with floral, ginger-grassy undertones and no acidity (lemon scent without sourness). The lower stalk, finely minced, is intensely fragrant; the woody tops give a gentler citrus perfume to liquids. Fibrous texture means thorough mincing or removal of whole pieces.

Culinary uses

Pounded into Thai/Lao/Cambodian/Vietnamese curry pastes and marinades; whole bruised stalks simmered in tom yum, tom kha, broths, and Vietnamese phở-adjacent soups; finely minced raw into Thai salads (larb), grilled meats (Vietnamese thịt nướng), and Indonesian/Malay rempah; steeped for tea. Pairs with galangal, kaffir lime, chili, fish sauce, coconut, and garlic.

Regional variations

Thai cooking pounds the lower stalk into pastes and salads. Vietnamese cooking minces it into marinades and grills (xả). Indonesian/Malay cooking bruises whole stalks (serai) into rendang and gulai. Sri Lankan and Indian cooking use it in some curries and teas.

Cultural & historical context

A foundational Southeast Asian aromatic, lemongrass is one of the "holy trinity" of Thai paste aromatics alongside galangal and kaffir lime, and a daily flavor across the region. It's also a global tisane and the source of citronella's insect-repelling reputation, giving it a dual food/medicinal identity.

Substitution & sourcing — Lemon zest gestures at the citrus but lacks the floral-grassy depth and the ability to perfume a broth; there's no true swap for a paste. Frozen minced or whole frozen stalks are excellent and beat dried decisively. Buy fresh stalks (firm, pale, fragrant bulb ends) at Southeast Asian, and many general, groceries; peel tough outer layers, use the lower stalk, bruise the tops for broth. Freeze extras.

Reference notes

Tags: `aromatic`, `grass`, `citrus`, `curry-paste-base`, `whole-stalk-technique`. Related ingredients: [Galangal], [Kaffir Lime Leaf], [Ginger], [Turmeric]. Related cuisines: Thai, Vietnamese, Lao, Indonesian, Sri Lankan. Suggested links: a "using the whole lemongrass stalk" technique note; the Thai-paste-trinity cross-link.