As a general and common sense guideline, the taste purpose is to guide the "being" to eat what their body need to work properly, therefore we can suppose that whatever gives the Kran a good source of energy (like crystals if you take a look at the released recipes while ores are more "like" meat crystals are more like salts, sugars, bread, ...) can make them feel a good taste maybe not too different from what we feel like when eating sugar.
Feel free to expand your RP with varied flavour, tastes etc.