Kaki no Ha Sushi and Nara Cuisine: Persimmon Leaf Preserved Sushi Culture

Ingredients

• 300 g Japanese short-grain rice, cooked and seasoned as shari
• 2 tbsp rice vinegar, for seasoning cooked shari
• 1 tsp sugar, dissolved into rice vinegar seasoning
• 1 tsp fine salt, dissolved into rice vinegar seasoning
• For the fish
• 250 g saba (mackerel) fillet, or salted salmon, salt-cured (shime-saba); sliced into pieces sized to top each rice portion
• 2 tbsp rice vinegar, for additional light vinegar treatment of shime-saba before wrapping
• 12–16 persimmon leaves (kaki no ha), autumn-harvested, dried to optimal moisture; wiped clean — not washed

Method

1. 1
   Season the cooked shari while warm: fold rice vinegar, sugar, and salt through the rice with a cutting motion using a flat wooden paddle. Fan simultaneously to cool the grains rapidly. The rice is ready when the grains are glossy, distinct, and hold together under gentle pressure without becoming adhesive or crushed.
2. 2
   Treat the shime-saba: if using salt-cured mackerel, apply a light secondary vinegar treatment — moisten each slice with rice vinegar and allow to rest briefly before use. This double acid treatment is the safeguard for food safety during the extended pressing period. The fish is ready when the surface appears lightly opaque and the flesh is firm to the touch.
3. 3
   Form each portion: mould a compact oblong of shari, approximately the length of the fish slice, with enough pressure to hold cohesion but not to crush the grain structure. Lay one slice of saba or salmon across the top. This is where the dish lives or dies — the rice must be properly vinegared shari, as its acidity works in direct synergy with the persimmon leaf's catechins, phytoncides, and tannins during the pressing period; under-acidified rice cannot sustain the 12–24 hour fermentation safely or develop the characteristic flavour transfer.
4. 4
   Wrap each formed piece in a dried persimmon leaf, folding snugly so that the inner surface of the leaf — which bears the highest concentration of aromatic and antimicrobial compounds — is in direct contact with rice and fish. Arrange pieces in a wooden box or sealed container, seam-side down, in a single close-packed layer.
5. 5
   Apply moderate, even pressing weight — a flat board or second container set with a weight distributed evenly across the surface, following the entry's caution against excessive pressure that would damage rice grain structure. Refrigerate at 8–12°C for a minimum of 12 hours, and up to 24 hours. The sushi is ready when the leaf has imparted a faint herbal, tannin-edged fragrance perceptible through the wrapper and the rice has absorbed the aromatic compounds of the leaf.
6. 6
   Serve the pieces still wrapped in their persimmon leaves — the leaf is part of the traditional aesthetic. The guest unwraps at the table.