Mekabu and Natto

I was walking through Shinjuku station and saw this in a shop. From a distance, it looked like green tea. It's mekabu, a part of wakame (kelp). The sign suggests two ways of eating it:

1) soak it in water for 10 minutes and serve with vinegar, grated daikon or natto.

2) use it as it is in miso soup, udon, soba, or clear broth.

Bigger pieces of mekabu. Mekabu is supposed to be good for the immune system.

This is natto. It's fermented soybeans. It is really sticky and stinky. It's good for your health, though. Papa stirs in a raw egg before he eats it.