How to Use Lemongrass
The Citrusy Blades
Citrusy · Bright · Fresh · Floral
A cornerstone of Thai curry pastes, Vietnamese marinades, and Indonesian braises, these fibrous stalks infuse dishes with a bold, lemony lift.
FORMS
- Fresh: Firm, pale green stalks with a tight layered structure are the premier culinary form. Fresh lemongrass delivers a clean citrus punch with a hint of ginger and floral sweetness. Look for stalks that are firm, heavy for their size, and tightly wrapped, with no browning or sponginess. Limp or hollow stalks are old and will have lost much of their aroma.
- Dried: Sold as sliced rings, chopped pieces, or powder. They're all serviceable substitutes but a real step down, since drying drives off much of the bright top notes, leaving a milder, hay-like flavor. Rehydrate dried pieces in warm water for 15-20 minutes, or add them early to a simmering liquid. Powder disperses easily and suits rubs and marinades.
- Frozen and Paste: Frozen stalks, now widely available in Asian groceries, hold far more flavor than dried and are the best substitute when fresh isn't around. They thaw quickly and are prepared exactly like fresh. You can also find pastes, which can be convenient. Neither option is as nuanced as fresh, but both carry the citrus-ginger character well enough for curries, soups, and stir-fries.
STORAGE
- Fresh: Whole untrimmed stalks keep for 2-3 weeks in the refrigerator, wrapped loosely in a damp paper towel and bagged. The tightly layered structure protects the aromatic core from drying out, so lemongrass outlasts delicate herbs like cilantro or basil by a wide margin. For longer storage, freeze whole stalks or pre-sliced pieces in airtight bags for up to 6 months. Frozen stalks lose some texture but keep their aroma, and they can be sliced or pounded straight from the freezer.
- Dried: Store in an airtight jar in a cool, dry, dark place, and it'll keep for up to a year, though the flavor weakens noticeably after six months. Larger pieces hold their aroma better than ground. If rubbing the pieces between your fingers releases no citrus scent, the oil is gone, and they're basically finished.
- Frozen and Paste: Frozen stalks keep for 6 months in a well-sealed bag, and vacuum-sealing extends that further by preventing the freezer burn that dulls the flavor. Paste keeps refrigerated for several months after opening, but check the jar for the manufacturer's date and watch for discoloration.
PREPARATION
- Trimming: Cut off the top two-thirds of the stalk. Those long grassy leaves are too fibrous to eat, though they're worth saving for stocks and teas. Peel away the one or two outermost layers from the bottom portion until you reach the smoother, paler core, then trim the woody root end. What's left is 4-6 inches of usable stalk, and that's where the bulk of the flavor lives.
- Cutting: How you cut it determines its role. For soups, curries, and broths where the lemongrass gets strained out, cut the trimmed stalk into 2-3 inch lengths and bruise them firmly with the back of a knife or a pestle to crack the fibers and release the oils. For dishes where it's eaten, such as salads, stir-fries, larb, and dipping sauces, slice the tender core into the thinnest possible rings or mince it fine. The fibers are so tough that thin slicing is mandatory.
- Pounding: In Thai and wider Southeast Asian cooking, lemongrass is traditionally pounded in a mortar with galangal, chilis, garlic, and shallots. Pounding ruptures the cells more thoroughly than slicing and produces a paste that disperses evenly through a curry rather than sitting in it. Add lemongrass after the harder ingredients like galangal, since it breaks down more readily.
- Steeping: Dried lemongrass needs time rather than force. While fresh stalks give up their oils to bruising and pounding, dried pieces release theirs slowly into hot liquid. Add them at the start of a simmering broth, syrup, or poaching liquid rather than partway through. For quicker dishes, rehydrate the pieces in warm water for 15-20 minutes first, which softens the fibers and wakes the aroma before they hit the pan.
COOKING
- Infusing for Depth: This is the most common use. Bruised stalks are simmered in soups, broths, curries, and coconut milk to release their citrus-ginger aroma, then removed before serving. This technique is used in tom yum, tom kha, and countless Southeast Asian curries. Add the stalks early and simmer gently, since prolonged hard boiling dulls the floral top notes and leaves only the woody backbone.
- Blooming in Fat: Lemongrass's aromatic compounds are fat-soluble, which is why a brief sauté of sliced or crushed stalk in oil, coconut milk, or ghee before the liquid goes in makes such a difference. The fat carries the citrus through the whole dish rather than leaving it suspended in the broth. This step lays the foundation that chilis, garlic, shallots, and fish sauce build upon.
- Eating It Directly: Sliced thin enough, lemongrass becomes an ingredient rather than a flavoring. Fine rings of the tender core are essential to Thai salads like yam takhrai, a lemongrass salad with shrimp, and to Vietnamese dipping sauces and marinades. Minced lemongrass also works in stir-fries, added early so the heat softens the fibers and rounds the sharpness into a sweeter warmth. Filipino cooks tie whole stalks into a knot and stuff them into the cavity of a lechon to perfume the meat from the inside.
- Beyond Savory: Lemongrass makes a bright, caffeine-free tea, steeped fresh or dried in just-boiled water for 5-10 minutes. It's very good with ginger, honey, and lime. In desserts, infuse it into cream or coconut milk for panna cotta, ice cream, or custard. It's great at adding a citrus lift without the acidity that actual lemon juice would bring.
A Thai coconut curry soup. This is the kind of broth where lemongrass really shows what it can do. Bruised stalks go in early and slow-steep alongside galangal and makrut lime leaves, building that bright, citrusy backbone you can taste in every spoonful.