Crispy Aji Fry with Tartar and Lemon

Why You’ll Love This Recipe

• Shatteringly crisp panko crust with moist, flaky fish inside.
• Classic Japanese comfort plate: lemon, shredded cabbage, sauce, and steaming rice.
• Approachable technique and pantry-friendly ingredients.
• Restaurant-quality results in under an hour.

Grocery List

• Produce: 1 green cabbage, 1 lemon, 1 small onion, fresh ginger, fresh parsley (optional)
• Dairy: None (unless using milk in egg wash, optional)
• Pantry: Horse mackerel (aji), panko, all-purpose flour, eggs, neutral frying oil, mayonnaise, dill pickles, rice vinegar, soy sauce, ketchup, Worcestershire sauce, honey or sugar, mirin, short-grain rice, salt, pepper

Full Ingredients

Fish

• 4 medium horse mackerel (aji), butterflied, skin on, pin bones removed (about 800 g total)
• 2 tbsp sake (or dry white wine)
• 1 tsp freshly grated ginger (optional but recommended)
• 1/2 tsp fine sea salt, plus more to finish
• Black or white pepper, to taste

Breading

• 1/2 cup (60 g) all-purpose flour
• 2 large eggs
• 2 tbsp cold water or milk
• 2 cups (100 g) panko breadcrumbs

Frying

• 6 cups (1.5 L) neutral oil (canola, rice bran, or peanut)
• Oil temperature target: 350°F (175°C)

Sauces (choose one or offer both)

• Quick Tartar Sauce: 1/2 cup (120 g) Japanese mayonnaise, 2 tbsp finely minced dill pickles, 1 tbsp finely minced onion, 2 tsp rice vinegar, 1 tsp lemon juice, 1/2 tsp sugar, pinch of salt and pepper, 1 tbsp chopped parsley (optional)
• Quick Tonkatsu Sauce: 3 tbsp ketchup, 1 1/2 tbsp Worcestershire sauce, 1 tbsp soy sauce, 1 tsp honey (or sugar), 1 tsp mirin, small pinch ground black pepper

For Serving

• 4 cups (280 g) finely shredded green cabbage
• 1 large lemon, cut into 8 wedges
• 4 cups cooked Japanese short-grain rice (about 2 cups/380 g uncooked)
• Optional garnish: chopped parsley or aonori

Step-by-Step Instructions

Step 1: Butterfly and season the aji

If starting with whole fish, scale and gut. Cut off the head, split along the belly, and carefully run a knife along each side of the spine to open the fish like a book, removing the backbone while keeping the tail intact if you like. Remove pin bones with tweezers. Rinse briefly and pat very dry. Place the fish in a shallow dish with the sake, ginger, and 1/2 tsp salt. Turn to coat and rest 10 minutes, then pat completely dry again. Lightly season both sides with pepper.

Step 2: Make the sauce(s)

For tartar, stir together mayonnaise, pickles, onion, rice vinegar, lemon juice, sugar, and a pinch of salt and pepper; fold in parsley if using. Chill. For tonkatsu, whisk together ketchup, Worcestershire, soy, honey, mirin, and pepper; set aside.

Step 3: Prep the sides

Shred the cabbage very finely and soak it in ice water for 5 minutes to crisp, then drain and pat dry. Cut the lemon into wedges. Cook rice according to package directions so it is ready to serve hot.

Step 4: Set up the breading station

Place flour in one shallow dish. Beat eggs with 2 tbsp water or milk in a second dish. Spread panko in a third dish. Arrange a wire rack over a sheet pan for draining after frying.

Step 5: Bread the fish

Working one piece at a time, dredge fish lightly in flour (shake off excess), dip into egg (let excess drip), then press into panko, gently patting to fully coat the surface and edges. Set the breaded fillets on a clean tray for 5 minutes so the coating adheres.

Step 6: Heat the oil

Pour 1 inch (2.5 cm) of neutral oil into a deep, heavy pan. Heat to 350°F (175°C), measured with a thermometer. Keep a steady medium heat to maintain 340–360°F (171–182°C) as you fry.

Step 7: Fry, drain, and serve

Fry the fish in batches, without crowding, 1.5–2 minutes on the first side and 45–60 seconds after turning, until deep golden and crisp and the thickest part flakes easily or reads 140–145°F (60–63°C). Transfer to the rack to drain and sprinkle lightly with salt. For extra crunch, return to the oil for 15–30 seconds at 365–375°F (185–190°C). Serve immediately with lemon wedges, tartar or tonkatsu sauce, a mound of shredded cabbage, and hot rice.

Pro Tips

• Dry fish equals crisp crust: after marinating, pat completely dry before dredging.
• Do not compact the panko; a loose, shaggy coat creates the lightest crunch.
• Use a thermometer and fry in small batches to keep oil at 350°F (175°C).
• Drain on a wire rack, not paper towels; airflow preserves crackle.
• For a dramatic finish, a brief second fry at 365–375°F (185–190°C) makes the panko extra light.

Variations

• Air Fryer Aji Fry: Mist breaded fish generously with oil. Air fry at 400°F (200°C) for 8–10 minutes, flipping at 6 minutes, until golden and flaky.
• Shiso Aji Fry: Lay a shiso leaf on the flesh side before breading to add herbal aroma and a beautiful imprint under the panko.
• Aji Katsu Sando: Tuck a hot fillet into milk bread with shredded cabbage and tonkatsu sauce for a craveable sandwich.

Storage & Make-Ahead

Breaded, uncooked fillets can be prepared up to 6 hours ahead and kept refrigerated on a tray, lightly covered. To freeze, place breaded fillets on a sheet pan until firm, then store in an airtight container for up to 2 months; fry from frozen at 350°F (175°C) for 3–4 minutes. Cooked aji fry is best fresh but will keep 1–2 days refrigerated; re-crisp in a 400°F (200°C) oven or air fryer for 6–8 minutes. Tartar sauce can be made 2 days ahead; keep chilled. Shredded cabbage can be washed and spun dry, then refrigerated in a sealed container with a paper towel for 24 hours.

Nutrition (per serving)

Approximate per serving with 1 cup cooked rice and 1 tbsp tartar sauce: 750–800 kcal; 37 g protein; 80–90 g carbohydrates; 28–35 g fat; 2–3 g fiber; 900–1,200 mg sodium. Values will vary based on oil absorption and sauce amount.