It might be made with grapes instead of rice, but dry sherry is still a sweet wine. It’s also closer in color to hon mirin and is delicious in teriyaki and pan sauces. Use the same wine-to-sugar ...
While there aren't any true flavor substitutes for mirin, sake with honey or another sweetener can be used in a pinch. So can dry vermouth or sherry. There are also common imitation mirin products ...