Koji-Sweetened Bettarazuke: The Golden Jewel of Tokyo Pickles

🌍 Cuisine: Japanese
🏷️ Category: Fermented & Cultured
⏱️ Prep: 30 minutes (plus 4-5 days curing time)
🍳 Cook: 10 minutes
πŸ‘₯ Serves: 10-12 servings

πŸ“ About This Recipe

Bettarazuke is a celebrated specialty of Tokyo's Nihonbashi district, traditionally enjoyed during the 'Ebisu-ko' festival to bring good fortune. Unlike standard pickles, these daikon radish rounds are cured in a luscious mash of rice koji and sugar, resulting in a crisp texture and a sophisticated, milky sweetness. This fermented treasure offers a refreshing crunch and a delicate umami finish that makes it the crown jewel of any Japanese pickle platter.

πŸ₯— Ingredients

The Daikon Base

  • 1 large Daikon Radish (about 2 lbs, peeled and halved crosswise)
  • 4 tablespoons Sea Salt (high quality, non-iodized preferred)
  • 1/2 cup Granulated Sugar (for the initial salt-cure draw)

The Sweet Koji Mash (Bettara-doko)

  • 300 grams Rice Koji (dried or fresh koji rice grains)
  • 1/2 cup Glutinous Rice (soaked for 1 hour)
  • 1 cup Water (filtered)
  • 1 cup Granulated Sugar (adjust to preference for sweetness)
  • 2 tablespoons Mirin (hon-mirin preferred)
  • 1 tablespoon Sake (to help preserve the mash)

Aromatics & Finishing

  • 1-2 pieces Dried Red Chili Pepper (deseeded and sliced into thin rings)
  • 1 teaspoon Yuzu Zest (thinly slivered for a citrusy aroma)
  • 1 piece Kombu (2-inch square, wiped with a damp cloth)

πŸ‘¨β€πŸ³ Instructions

  1. 1

    Prepare the daikon by peeling it deeply to remove the fibrous outer skin. Cut the radish into thick rounds or semi-circles about 1.5 inches thick.

  2. 2

    Place the daikon in a large bowl and rub thoroughly with the sea salt and the first 1/2 cup of sugar. This 'dual-cure' helps draw out moisture while softening the sharp radish bite.

  3. 3

    Transfer the daikon to a pickling container or a heavy-duty gallon freezer bag. Place a weight (about 2-3 lbs) on top and refrigerate for 24-48 hours. Drain the liquid that accumulates.

  4. 4

    While the daikon cures, make the sweet rice base. Cook the soaked glutinous rice with 1 cup of water in a rice cooker or small pot until very soft and sticky.

  5. 5

    Let the cooked rice cool to approximately 140Β°F (60Β°C). This temperature is crucial; too hot will kill the koji enzymes, too cool will slow the saccharification.

  6. 6

    Stir the rice koji into the warm glutinous rice. Keep this mixture in a warm place (like a thermos or a yogurt maker) for 6-8 hours until it becomes sweet and slightly liquidβ€”this is essentially a thick 'amazake'.

  7. 7

    Stir the remaining 1 cup of sugar, mirin, and sake into the koji mash. Let it cool completely to room temperature.

  8. 8

    Remove the daikon from the salt-cure. Rinse them briefly under cold water to remove excess salt and pat them very dry with paper towels.

  9. 9

    In a clean container, spread a layer of the sweet koji mash. Lay the daikon on top, adding the chili rings, yuzu zest, and kombu strips between layers.

  10. 10

    Cover the daikon completely with the remaining mash, ensuring no air pockets remain. Seal the container tightly.

  11. 11

    Refrigerate for 3 to 5 days. The flavors will develop and the daikon will take on a translucent, ivory appearance.

  12. 12

    To serve, remove a piece of daikon, lightly scrape off the excess mash (leave a little for flavor), and slice into 1/4 inch thick pieces.

πŸ’‘ Chef's Tips

Always use a clean, dry spoon when removing pickles from the container to prevent spoilage. If you cannot find fresh yuzu, a mix of lemon and lime zest provides a similar bright citrus note. Don't discard the leftover koji mash; it can be used to marinate fish or chicken for grilling. Ensure the daikon is patted completely dry before the second ferment to prevent the mash from becoming too watery. For a deeper yellow color, some traditional recipes add a pinch of turmeric or dried gardenia fruit.

🍽️ Serving Suggestions

Serve as a palate cleanser alongside rich dishes like Tonkatsu or grilled Unagi. Pair with a glass of chilled, dry Junmai Ginjo sake to contrast the pickle's sweetness. Include as a component of a traditional Japanese breakfast with miso soup and steamed rice. Slice thinly and serve atop a bowl of ochazuke (rice with green tea) for a comforting snack. Arrange on a 'tsukemono' platter with pickled ginger and shibazuke for a vibrant appetizer.