Mirin

This is a mirin substitute because real mirin without high fructose corn syrup is hard to find on stores. Choose one of these. Any will work.

50ml white wine 50ml sherry

And mix with sugar.

1/4 tsp sugar

I *think* you can store this out of the fridge, otherwise the sugar would crystallize in it. Originally seen at Diaries of a Master Sushi Chef