
Kombu is a kind of kelp/seaweed and I see those are safe; the company claims indefinite shelf life. So if they don't smell funky when I break the seal, I'm thinking it's okay to use. Should I soak them, or break/grind them up dry?
Bonito flakes, I can't find any reference to on either the safe/unsafe food lists or by searching the forum. Are they safe for crabs? The shelf life info I've found is inconsistent, so even if it's a safe food I might toss the bag and get new.
Incidentally, the bags are leftover from when I did a lot of cooking from the book Japanese Women Don't Get Old or Fat, I always had a pitcher of dashi ready to go in the fridge! Good stuff (now I'm hungry!).