Make Tenkasu. Mix flour and water in a bowl. Drop the batter with a brush or several chopsticks in deep-frying oil at medium high heat (350F or 175C). Scoop out fried batter when it starts floating on the surface and browning. Set on a paper towel.

Heat Dashi to a boil, and add salt, Soy Sauce, Mirin, Sake. Cover and keep it warm.

Cook dried Soba noodles according to the package. Add cooked Soba to the hot soup and let it simmer for a minute.

Divide noodles and soup into bowls, top with cooked fried Tenkasu and chopped green onion. Add Shichimi if you like.