Substitute: Garlic ginger soy sauce needs to be made in advance, so if you want to make this recipe right away, substitute it by mixing soy sauce, grated garlic, and grated ginger. If you don't have potato starch, you can substitute it with flour or cornstarch.
Storage: It will last for 3 days in the fridge.
Tempeh soaks up cooking oil so if you run out of oil, pour some more.