This rendition of kushiyaki — the catch-all term for the popular Japanese technique of grilling skewered foods — is a play on a surf and turf, combining salmon with earthy shiitake mushrooms, for a dose of umami. Here the fish is first marinated in a mirin, sake and miso mixture; the same mixture is also brushed on the skewers during cooking for a burnished glaze. Finish the skewers with a generous shake of furikake or shichimi togarashi, two popular Japanese seasonings.