Finishing & garnish
zi su (perilla leaves)
zi su · Fresh leaves of Perilla frutescens, an aromatic annual herb of the mint family (Lamiaceae), prepared as a raw finishing and wrapping component used across Korean, Japanese, Chinese, and Southeast Asian cuisines.
The formula
1:0 fresh perilla leaves : other ingredients (single-ingredient prep)
The base is the leaf itself; only cold water is used for washing, with no seasoning or transformation.
Identity
- Botanically Perilla frutescens, a member of the mint family (Lamiaceae), unrelated to sesame
- Leaves are tear-drop shaped with serrated edges
- Aroma combines basil, mint, and anise/licorice notes
- Appears in two principal color forms: green (often Japanese shiso) and purple-red (Chinese zi su / Korean kkaennip)
- Used raw, never cooked into the leaf itself in most applications — it is a finishing and wrapping component
Ingredients
| Base | fresh perilla leaves (zi su / kkaennip / shiso) | Select vibrant, unbruised leaves; both green and purple varieties are acceptable depending on the cuisine. |
| Liquid | cold water | Used only to gently rinse the leaves; never soaked, as prolonged water contact washes away the volatile aromatic oils. |
Method
- 1Inspect and select leaves that are brightly colored, intact, and free of dark spots, insect damage, or wilting.Perilla leaves bruise easily and oxidize quickly; only pristine leaves hold their characteristic anise-basil aroma at the point of service.
- 2Rinse briefly under a gentle stream of cold water, handling the leaves by their stems.A short, gentle rinse removes surface grit while preserving the fragile, aromatic oils that define the leaf.
- 3Pat dry immediately with a clean kitchen towel or spin in a salad spinner lined with a towel.Residual moisture accelerates wilting and dilutes the essential oils, so the leaves must be dried promptly.
- 4Trim the stems flush with the leaf base if the leaves are to be plated whole, or leave a short stem for wrap-and-pick-up service.Stem length dictates how the diner handles the leaf — short-stemmed for garnishing, longer for use as a hand wrap for grilled meats.
- 5Store loosely covered with a barely damp paper towel in a sealed container until service, then portion as whole leaves, torn pieces, or chiffonade.Light humidity keeps the leaves supple and aromatic without promoting rot, allowing them to be deployed as a reusable garnish throughout service.
Techniques that matter
Gentle quick-rinse
Perilla's signature aroma comes from volatile oils (perillaldehyde, limonene) that are water-soluble; prolonged washing strips them.
Tear or chiffonade only at moment of service
Cut perilla blackens rapidly from enzymatic oxidation, so the leaf should remain whole until the plate is being built.
Stem-handling during prep
Holding the leaf by its stem prevents fingerprint bruising of the tender blade and preserves the visual presentation.
Variations & derivatives
Purple perilla (aohojiso / zi su)China, Korea
Deep purple-red leaves with a stronger, more anise-forward aroma; the variety most often used in Korean BBQ wraps and Chinese sauces.
Green shiso (ao-jiso)Japan
Smaller, more pointed leaves with a mintier, less anise-like profile; standard for sushi, sashimi garnish, and tempura.
Kkaennip (large-leaf Korean perilla)Korea
Larger, broader leaves than Japanese shiso, favored for ssam wraps around grilled bulgogi and galbi.
Used in these dishes
Substitutions
- Korean kkaennip → Japanese green shiso — Similar family and aroma, but shiso is smaller, pointier, and more mint-forward; works for garnishing but not ideal as a large BBQ wrap.
- Perilla leaves → Thai basil leaves — Provides a sweet, slightly anise-like herbal note, but lacks the serrated leaf shape and the unique perillaldehyde aroma.changes result
- Perilla leaves → Mint + basil blend — Combining mint and sweet basil can approximate the cooling-anise profile, but cannot replicate the exact aromatic chemistry.changes result
Troubleshooting
Leaves wilt and turn limp within hours of prep
Excess residual moisture from washing or storage at warm temperature → Dry leaves more thoroughly before storing and refrigerate at 2–5 °C with a barely damp paper towel.
Cut or torn leaves turn black on the plate
Enzymatic oxidation of the leaf tissue once cells are ruptured → Leave leaves whole and tear or chiffonade only at the moment of plating; never cut ahead of service.
Aroma is muted or tastes flat/grassy
Leaves are over-mature, or the aromatic oils were washed off by prolonged soaking → Source younger, smaller leaves and limit rinsing to a brief, gentle stream of cold water.