Found a few other references to these foods tested by the Institute of Making
After three years of research, they unleashed the spoons on this complex Indian dinner, served with a flight of seven beers. The sight of 15 adults sucking their spoons like babies was an unusual start to a dinner party, but they had surprisingly different flavours. Copper and zinc were bold and assertive, with bitter, metallic tastes; the copper spoons even smelt metallic as they gently oxidised in the air. The silver spoon, despite its beauty, tasted dull in comparison, while the stainless steel had a faintly metallic flavour that is normally overlooked. As Miodownik pointed out, we were not just tasting the spoons but actually eating them, because with each lick we were consuming “perhaps a hundred billion atoms”.
When the spoons were tasted with food, there were some surprising revelations. Baked black cod with zinc was as unpleasant as a fingernail scraped down a blackboard, and grapefruit with copper was lip-puckeringly nasty. But both metals struck a lovely, wild chord with a mango relish, their loud, metallic tastes somehow harmonised by its sweet-sour flavour. (“With sour foods, like mango and tamarind, you really are tasting the metal,” says Laughlin, “because the acid strips off a little of the surface.”) Tin turned out to be a popular match for pistachio curry. And Laughlin sang the praises of gold as a spoon for sweet things: “Gold has a smooth, almost creamy quality, and a quality of absence – because it doesn’t taste metallic.”
As well as the full publication called The use of standard electrode potentials to predict the taste of solid metals which appeared in Food Quality and Preference vol.22
I have found this Journal to be an amazing tool, there are many topics on the lesser thought of aspects of cooking, presentation, and consumption of the perfect dishes.