Iwashi no Unohana-zuke (Vinegared Sardines with Okara)

Quick answer

Total time: 47 min
Level: Hard
Servings: 4 servings
Ingredients: 9

About this dish

Iwashi no unohana-zuke is an Ibaraki dish of small sardines salted, soaked in vinegar, and packed inside and out with cooled okara cooked with sugar, vinegar, carrot, yuzu, and chili.

Salt and vinegar do not kill Anisakis larvae, so the sardines must be intended for raw consumption and previously frozen at minus 20C for at least 24 hours or processed under equivalent controls. Keep the fish cold throughout preparation, use clean separate tools, refrigerate the finished dish, and eat it promptly rather than treating it as a shelf-stable pickle.

Ingredients (4 servings)

Ingredient	Amount	Unit
previously frozen raw-grade small sardines	9	piece
coarse salt	100	g
rice vinegar for sardines	100	ml
fresh okara	100	g
julienned carrot	30	g
sugar	36	g
rice vinegar for okara	45	ml
yuzu	0.5	piece
dried red chili	1	g

Instructions

Read the steps as a cooking flow: prep, heat, seasoning, doneness control, and finish.

6 steps

1

Step

Thaw 9 previously frozen raw-grade sardines under refrigeration and keep at or below 4C.

Remove heads and guts, open by hand, remove the backbone and belly bones, rinse briefly, and pat dry.
2

Season

Coat both sides with 100g coarse salt and refrigerate for 30 minutes.

Rinse off the salt with 50ml sardine vinegar and arrange the fish in a clean container.
3

Step

Pour over the remaining 50ml sardine vinegar and refrigerate for at least 30 minutes, turning once.

Drain and blot the fish surface dry.
4

Control

Julienne the yellow peel from half a yuzu and squeeze its juice.

Cook 100g okara, 30g carrot, 36g sugar, 45ml okara vinegar, and 1g chili over medium heat for about 8 minutes until dry.
5

Prep

Turn off the heat, mix the yuzu peel and juice into the okara, spread it out, and cool completely.

Do not combine warm okara with the cold fish.
6

Finish

Open each sardine, place cooled okara inside, and close lightly.

Coat the skin side thinly with more okara, shape, arrange on a chilled plate, and serve promptly.

Practical Cooking Checks

The cues that matter most while cooking.

Key technique: Previously frozen raw-grade sardines salted then vinegared
Finish cue: Coat the skin side thinly with more okara, shape, arrange on a chilled plate, and serve promptly.
Avoid this: MAFF states that salt and vinegar do not kill Anisakis, so use raw-grade sardines frozen at minus 20C for at least 24 hours.
Storage and reheating: Keep the fish cold throughout preparation, use clean separate tools, refrigerate the finished dish, and eat it promptly rather than treating it as a shelf-stable pickle.