Takana (Bongo) onigiri
A home version inspired by the shop filling named above. The shops do not publish their recipes; these quantities are this site's own. This page makes one filling, then shapes and serves it. Start with plain cooked Japanese short-grain rice: rice cooking, hand shaping and all shop fillings →. The filling preparation time below excludes cooking the rice.

Step by step
Filling

Chop the takana finely and squeeze out as much liquid as possible. 
Fry the dry greens with sesame oil and chilli for 2–3 minutes; add soy, then sesame seeds at the end. 1Takana
medium-high~4 minFor this step
- Pickled takana (mustard greens)100 g
- Sesame oil (takana)1 tsp
- Dried chilli, sliced½
- Soy sauce (takana)1 tsp
- Sesame seeds1 tsp
- Chop the takana finely and squeeze out as much liquid as you can.
- Fry it in the sesame oil with the chilli over medium-high heat for 2–3 minutes, add the soy and cook until dry. Stir in the sesame seeds.

Should look like this Shape by hand

A heaped spoon of dry takana in the well, then rice to cover. 2Shape them shop style
~2 min eachFor this step
- Cooked rice, from the onigiri page480–720 g (120 g each)
- Kosher salt (for your hands)a little for each onigiri
- Have the cooked rice ready, covered, and cool it only until comfortable to hold. Wet your hands and rub a little salt over both palms.
- For each onigiri, put about 60 g rice in your palm, make a well and add a heaped tablespoon of filling. Cover with another 60 g rice and gently close the rice around it. Save any extra filling separately.
- Cup the rice from below with one hand. Bend the other hand into a roof, press gently to make a corner, turn a third of a turn and repeat. Keep it loose: press only enough to hold together.

Should look like this Finish

3Wrap and serve
For this step
- Nori strips4–6
- For the shop-style finish, set a little of the same filling on top so you can see what is inside. Leave the top uncovered by nori.
- Wrap one strip of nori around the base and up the sides just before serving. Eat within the hour while the nori is crisp. The sliced example shows the inside; cutting yours open is optional.
Based on: Hidden Japan Gems — Onigiri Bongo menu · MICHELIN Guide — Onigiri Asakusa Yadoroku · Asakusa Yadoroku (official) · Nigihaya, Kyoto (official, Japanese) · Togoshi-ya (official, Japanese)