I've had natto at sushi bars and found it tasty enough. It is supposed to be very good for you.
Just read the amazing book "In Defense of Food" by Michael Pollan, who says that I am to eat no food my grandmother wouldn't recognize. Now my own grandmother certainly wouldn't have recognized natto, but I assume a Japanese grandmother would, so I'm guessing it's an okay traditional food.
But I go to the market and there are tubs of the stuff and I have no idea which one to buy. I think I've seen it in jars as well. (No, despite Michael Pollan's advice to grow and make your own food, I won't be fermenting my own natto - 10-hour workdays kind of cuts into your time for natto-making).
And once I figure out which one to buy, exactly how long will it keep in my fridge? And what exactly do I do with it other than dump it over some rice?