A dish for sybarites this, with sea flavours perfectly preserved by a brief marination in fresh citrus juice; lime, lemon and bitter orange are all suitable dressings. An hour or two in the marinade is enough to turn the fish's flesh opaque, allowing the flavour and texture to remain fresh and bright. The technique is suitable for any firm-fleshed fish, alone or in combination; try tuna, bass, bream, scallops (without the coral), squid or oysters, for instance. If you like, the prawns can be replaced with diced avocado.
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