Credit for the name of this recipe must go to my dear friend and taste-tester, Caroline, who upon trying it couldn’t work out how I’d done it and upon asking me, I replied with a triumphant ‘ha!’ and ran from the room with glee to fetch some more. It’s not a direct replica of a tuna sandwich, but it’s a pretty good replacement, and can be knocked up in a jiffy. Aonori is a kind of finely ground seaweed powder that can be found in higher-end supermarkets with the herbs and s