This is by far the most slimy (in a peculiarly good way) dish I ever made and ever encountered. I decide to make this after I saw this recipe on line. This is like tuna "Yamakake" やまかけ but instead of grated "nagaimo" 長いもor "yamaimo", this green slime was made of okra.
Okra: This is one pack of okra (about 12 okra). I first rubbed the surface with kosher salt to remove the "fuzz" and washed away the salt. I blanched for 30 seconds to 1 minute in salted rapidly boiling water (or until the okra’s green color becomes bright). I then drained and dunked the okra into ice water to keep the green color (picture below). I removee the ends and roughly chopped them up. I used an emersion blender and the plastic container that came with the blender. I added an equal mixture of concentrated dipping sauce (menstuyu 麺つゆ) and water and I blended to get a nice consistency.
Tuna: I used the "akami" 赤身 portion of Bluefin tuna I got from Catalina. I just cut it into a bite size cubes and marinated in a mixture of soy sauce and sake (1:1) overnight in a refrigerator.
I assembled it exactly like "Yamakake". I poured the grated okra into the bottom of a small bowl, placed the marinated tuna cubes on top and garnished it with strips of nori and perilla.
The taste?? This is very interesting. This is slime on steroids. It is even more viscous than nagaimo (I could have put more liquid to make it looser) but it has the refreshing green taste of fresh okra. Certainly, this is very unique way of using okra. I may try a different variation in the future but we prefer nagaimo for yamakake dish. Amazingly, I was more resistant to the idea of this green slime than my wife was—she is definitely not a fan of okra but she seemed to like this.