Soba is a Japanese thin noodle made from buckwheat.
Kake soba is the simplest hot type soba dish.
Boiled soba is drained. and put into bowl. Poured soysauce based hot broth.
"kake" means "pour" in English in this case.
And topped with finely sliced green onion.
We usually sprincle a little of red peper on it.
The broth is made from soysauce, sweet sake, and dried bonito.
It is mild flavor.