Grind ½ tbsp dashi granules, 1 tsp bonito flakes (katsuobushi), ½ tsp salt, and ½ tsp sugar together using a mortar and pestle.
Pour the mixture into a small bowl and add ½ tsp matcha powder. Mix until combined.
Right before you use it, add 1 tbsp arare (or a crunchy substitute), 1 tbsp kizami nori (shredded nori), and 1 tbsp toasted white sesame seeds and mix until evenly distributed.
Divide 250 g cooked Japanese short-grain rice between serving bowls. Spoon the ochazuke mixture over the top.
Prepare 250 ml freshly boiled water and pour it down the side of each bowl rather than directly on top.
Serve immediately and mix gently. Enjoy!
Notes
Grind the coarse things first, add the matcha after: Flakes, crystals, and granules have to come down to the same size before they act as a single seasoning. Matcha has nothing left to break, and an even green tells you it reached everything.A wet spoon is what ruins the jar: The risk starts on your second bowl, when the spoon has already been near steam or a wet counter. Fine powder takes that water and sets into lumps you have to break apart before you can measure anything again.Crushed crackers need more spoon than arare: Arare grains pack a spoon solid, while anything you crush yourself lands as loose, uneven pieces with air between them. Scooped the same way, the crushed version arrives short and the bowl comes out weak.Eat it the moment the water is in: Every second the rice sits in liquid it drinks and swells, and the bowl turns from something you drink through into something you chew through. You have about a minute.