Mix natto: Open the pack of natto, add the natto sauce and karashi, and mix well.
Natto over rice: Prepare a bowl of rice and place the natto over the rice.
How to prepare toppings:
Grated Nagaimo: Peel and grate it, place it on the natto, and pour a bit of soy sauce.
Umeboshi: Remove the seed, chop it to make a paste, and place it on the natto.
Scallions: Chop them and place them on the natto.
Grated Daikon: Peel and grate it, and place it on the natto.
Kimchi: Place it on the natto.
Okra: Boil okra for a couple of minutes, chop them, put them on the natto, and top with katsuobushi.
Boiled egg: Mash it, season with mayonnaise, and put it on the natto.
Avocado: Cut it into bite-sized pieces, add a pinch of salt, and put it on the natto.
Notes
Substitute: If your natto doesn't come with sauce and karashi, you can use soy sauce or make it on your own by mixing soy sauce, dashi and sugar.
Storage: Keep natto in the fridge or freezer. When eating frozen natto, please leave it in the refrigerator for a half-day to defrost naturally. No microwave oven as it ruins the taste.