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1
Shuck the mussels, retaining all liquor. Inspect each mussel: the flesh must be firm and smell cleanly of the sea. Discard any that carry an off-odour at this stage.
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2
Press or pound fresh pūhā leaves to extract the juice. The liquid should run a clear, dark green and carry a bitter, vegetal sharpness on the tongue — this acid load is the agent that will govern the fermentation.
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3
Combine the shucked mussels and their liquor with the pūhā juice in a clean, non-reactive vessel. Ensure the mussels are fully submerged in the liquid. This is where the dish lives or dies: the ratio of pūhā acid to mussel mass must establish conditions in which preservation, not spoilage, takes hold — the acid and the anaerobic environment of the sealed vessel hold that line.
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4
Transfer the mixture to a pōhā (kelp bag) or a sealed non-reactive container that replicates its anaerobic conditions. Store in a cool place and allow to ferment for several days. The correct trajectory is signalled by a deepening marine and fermented aroma — intensely oceanic and vegetal, never putrid.
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5
Assess readiness: the mussels should be soft and partially broken down; the preparation should appear dark. The aroma is intensely marine, fermented, and vegetal. The taste is deeply oceanic, fermented, and complex. Any trace of putrefaction disqualifies the batch.