Japanese Kakinoha-Zushi: Persimmon Leaf Pressed Sushi of Yoshino

Ingredients

• 2 fresh mackerel (saba) fillets, skin on, or lightly salt-cured salmon fillets of equivalent weight
• 30 g fine sea salt, for the fish cure
• 500 g Japanese short-grain rice, cooked and seasoned with rice vinegar
• 60 ml rice vinegar, for seasoning the cooked rice
• 16 fresh persimmon leaves, harvested early summer; wiped clean, stems removed — must be fresh, not dried or wilted

Method

1. 1
   Lay the mackerel fillets skin-side down. Apply fine sea salt evenly across the flesh surface. Refrigerate uncovered for 1–2 hours. Rinse the cure away and pat thoroughly dry. The flesh should be firm to the touch and the surface visibly tightened — a pellicle has formed.
2. 2
   Season the warm cooked rice with rice vinegar, folding gently with a wooden paddle to avoid breaking the grains. Fan as you fold. The rice is ready when it holds its shape when pressed in the palm and carries a clean, bright vinegar scent without heaviness.
3. 3
   Slice the cured mackerel or salmon on a shallow angle into pieces sized to rest squarely atop a small block of rice — each piece approximately the width of two fingers. Shape the seasoned rice into corresponding oblong blocks, pressing firmly enough for cohesion. Place one slice of fish atop each rice block, skin-side or flesh-side up according to the fillet. This is where the dish lives or dies: the fish-to-rice ratio must be in balance, and neither element should dominate — the fish carries salt and cure, the rice carries vinegar, and the persimmon leaf will add tannin; all three must be given equal weight at this moment of assembly.
4. 4
   Lay a fresh persimmon leaf face-down on a clean surface. Place one assembled fish-and-rice unit at the centre of the leaf. Fold the leaf around the unit, wrapping tightly so the inner face of the leaf — carrying its tannins, catechins, and essential oils — is in direct contact with the fish surface. The parcel should be compact and secure, with no rice visible.
5. 5
   Arrange the wrapped parcels in a single layer in a deep tray or box, packed closely together. Lay a flat board or second tray across the top and apply an even weight. Press at cool room temperature or refrigerated for a minimum of 4 hours, and up to 8 hours. The parcels should emerge firm and cohesive, the leaf surface slightly darkened where the fish oils have begun to transfer. Do not serve before this time has elapsed — insufficient pressing leaves the flavours unintegrated and the structure loose.
6. 6
   At the table, unwrap each persimmon leaf parcel by hand, opening the leaf fully to reveal the sushi and release the aromatic. The fish surface will carry a faint herbaceous imprint from the leaf. The leaf is not eaten. Serve immediately once unwrapped.