If fresh waterleaf is unavailable, use approximately 12 ounces of fresh baby spinach, chopped. The flavor will differ slightly, but the recipe will still work.
Editan naturally carries a pleasant bitterness. Rehydrate, massage and rinse the leaves carefully, but avoid washing away every trace of their distinctive character.
Waterleaf releases moisture during cooking, so begin with a modest amount of stock. Add additional stock only when necessary. The finished soup should be generously leafy and richly spoonable, with the Editan remaining the defining flavor.