Sesame Oil vs. Perilla Oil

Both oils show up constantly in Korean cooking, they look broadly similar in the bottle, and recipes rarely explain why they've asked for one rather than the other. They aren't interchangeable, and the difference is easy to taste once you know what you're looking for.

Toasted sesame oil (chamgireum) is pressed from roasted sesame seeds. It's dark amber, intensely nutty, and assertive — a teaspoon is genuinely noticeable in a dish. Almost every use of it in Korean cooking is as a finishing oil: stirred into namul after blanching, drizzled over rice, mixed into a dipping sauce. It's the default when a recipe just says "sesame oil."

Perilla oil (deulgireum) is pressed from perilla seeds — the same plant family as the perilla leaves used for ssam. It's lighter in color, grassier and more herbal, with a distinctly green note where sesame is roasted and nutty. It's the traditional choice for seasoning wild-green namul like gosari and chwinamul, where its herbal edge complements the greens instead of overwhelming them.

The practical differences

Flavor. Sesame is nutty and roasted; perilla is green and herbal. If you substitute sesame where a recipe wants perilla, the dish still works but tastes noticeably more roasted and less fresh.

Smoke point. Neither is a frying oil. Toasted sesame oil in particular burns fast and turns bitter, which is exactly why it's added at the end rather than used to cook in. When a Korean recipe does start with sesame oil in the pan, it's usually over gentle heat and for a short time.

Shelf life. This is the one that catches people out. Perilla oil goes rancid noticeably faster than sesame oil — it's high in polyunsaturated fats, which oxidize quickly. Buy it in small bottles, keep it in the fridge once opened, and smell it before use. Rancid perilla oil smells sharp and paint-like, and it will ruin a dish.

Which to buy first

If you're only buying one, buy toasted sesame oil — it's used in far more recipes across the site and keeps much better. Add perilla oil later if you start cooking wild-green namul regularly, and buy the smallest bottle you can find.

Substituting: sesame oil for perilla works and is the common fallback. Going the other direction is less successful — perilla's grassiness sits oddly in dishes built around sesame's roasted flavor. Neither should be replaced with plain untoasted sesame oil, which is a neutral cooking oil and contributes almost no flavor at all.