Lemon myrtle (Backhousia citriodora) is native to the subtropical rainforests of Queensland, primarily between Mackay and Brisbane. It is the most concentrated natural source of citral on Earth — the compound that produces "lemon" flavour and aroma. Its citral content (90–98% of the essential oil) exceeds lemongrass (75–80%), lemon verbena (30–35%), and actual lemons (2–5%) by enormous margins. Aboriginal Australians used the leaves as a flavouring, a medicine, and an antiseptic for thousands of years before European contact.
The dried leaf is the usable form. Fresh leaves are intensely aromatic but lose potency rapidly after picking. Dried and milled lemon myrtle retains its citral content for months in sealed containers.
Lemon myrtle with barramundi, finger lime, and saltbush is the canonical Australian native flavour combination — the equivalent of a French fish with tarragon, butter, and white wine. Each component has a specific role: the myrtle provides aromatic lift, the finger lime provides acid, the saltbush provides mineral salinity.
- **Use with restraint.** The citral concentration means that lemon myrtle is not a like-for-like lemon substitute — it is perhaps 20 times more potent than lemon zest by weight. A quarter teaspoon of dried milled leaf can perfume an entire dish. Overuse produces a soapy, medicinal quality. - **Heat degrades citral.** Add lemon myrtle at the end of cooking or in cold preparations for maximum aroma. In baking, the protected environment inside a dough or batter preserves enough citral to be effective, but adding it to a simmering liquid will lose most of the aromatic within minutes. - **It is antimicrobial and antifungal.** The citral content makes lemon myrtle a natural preservative — lemon myrtle in marinades extends shelf life. This property was known to Aboriginal practitioners long before it was documented by food science.
- Using the same quantity as lemon zest — this produces an overwhelming, almost chemical lemon character - Adding to high-heat stir-fries or long-simmered stocks where the volatile citral evaporates entirely - Treating it as an exotic novelty rather than a precise flavouring agent with specific technical properties
AUSTRALIAN BUSHTUCKER — THE DEEP EXTRACTION