Eggplant tsukudani (after Nigihaya) 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 The shops do not publish their recipes; these quantities are this site's own.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

Salt the 1 cm eggplant cubes, leave for 10 minutes, then squeeze them firmly. 
Fry the squeezed eggplant in oil over medium heat for 4 minutes before adding soy, sugar and sake. 1Eggplant tsukudani
medium~20 minFor this step
- Japanese eggplants2 (about 250 g)
- Salt (eggplant)½ tsp
- Oil (eggplant)1 tbsp
- Soy sauce (eggplant)2 tbsp
- Sugar (eggplant)1 tbsp
- Sake (eggplant)1 tbsp
- Cut the eggplants into 1 cm dice, toss with the salt and leave 10 minutes. Squeeze them hard.
- Fry in the oil over medium heat until soft, 4 minutes. Add the soy, sugar and sake and cook, stirring, until the liquid is gone and the eggplant is dark and glossy, about 6 minutes.
- Nigihaya mixes its eggplant all through the rice instead of hiding it in the middle. Do the same: fold it into warm rice, then shape.

Should look like this Shape by hand

Fold the eggplant evenly through warm rice before shaping; no central pocket. 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.
- Fold the prepared eggplant evenly through 480–720 g warm rice. Divide into four to six portions, about 120 g rice per onigiri before adding the eggplant. There is no separate filling pocket.
- 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
- 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)