How do you make Dashi soup?

i'm trying to figure out how to make some takoyaki and it said something about dashi soup. i don't know what it is or how to get it or make it. if someone knows, please, it would be very much appreciated if you would tell me.



Thank you!!! XDHow do you make Dashi soup?
Ichiban Dashi (1st dashi)



Ingredients:

10 cm square of konbu (10g dried kelp), 10-20 g dried katsuobushi, 5 cups of water.



Wipe surface of kelp, removing dirt and sand by slightly damp kitchen towel.

Place water and kelp into pot, heat them on middle (rather low) flame.

Remove kelp when kelp comes up on surface. If you boil dashi, it becomes slimy and murky.

Just before it comes to a boil add katsuobushi at once, after 10 seconds turn off flame.

Prepare strainer covered with thin cloth on top.

When katsuobushi are sinking down place it on the strainer. Reuse the ingredients for 2nd dashi.How do you make Dashi soup?
Instant dashi is available in Asian markets. To make it from scratch is ok, but the ingredients can be hard to come by.

It comes in a box with a couple of packages of dried concentrated dashi.