Soy Sauce Subs -The sauce is a really simple 50/50 mix of Light and Dark Soy Sauce. If you only have all-purpose soy sauce to hand (meaning it is not labelled either light or dark) then you can substitute that entirely. Whatever you do, please DO NOT use only LIGHT or DARK soy sauce alone in the full amount of 4 tablespoons. Dark soy sauce will be way too intense and light soy sauce will be way too salty. If you only have one or the other, I recommend to only use half the amount in the recipe (2 tablespoons) to start then add more to taste when serving.