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Kuromitsu (Japanese Black Sugar Syrup)

Kuromitsu Japanese black sugar syrup drizzling from a spoon into a glass beaker
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Kuromitsu is a glossy Japanese black sugar syrup with deep molasses notes. Three ingredients, about 12 minutes on the stove, and it keeps for a month in the fridge.

Ingredients

Units Scale

Traditional version with kurozato:

  • 150 g Okinawan kurozato (unrefined black cane sugar), roughly chopped if in chunks
  • 120 ml (1/2 cup) water
  • 1 small pinch fine sea salt

Brown sugar pantry version:

  • 120 g dark muscovado sugar (the wet, sticky kind)
  • 30 g dark brown sugar
  • 1 tsp blackstrap or unsulphured molasses
  • 120 ml (1/2 cup) water
  • 1 small pinch fine sea salt
  • Optional: 1 tsp Dutch process cocoa powder or 1/2 tsp instant espresso, for depth

Optional finishing (either version):

  • 1 tsp wasanbon sugar, for shine and a slightly drier finish

Instructions

  1. If using kurozato in solid chunks, roughly chop it so it dissolves evenly. The brown sugar version needs no chopping.
  2. Combine your chosen sugars, the water, and salt in a small heavy bottomed saucepan. If you are using the optional cocoa or espresso with the brown sugar version, add it now. Set over medium low heat.
  3. Stir constantly with a heat safe spatula until the sugar fully dissolves, about 3 to 4 minutes for kurozato or 2 to 3 minutes for the brown sugar version. The mixture will look like dark coffee.
  4. Bring to a gentle simmer with small bubbles around the edges, not a hard boil. Cook without stirring for 8 to 12 minutes (7 to 10 minutes for the brown sugar version), until the syrup thickens visibly.
  5. Test for doneness: lift the spatula and let a few drops fall back into the pan. The syrup is ready when it falls in a thick stream and coats the back of the spatula. Drawing a finger through the coating should leave a line that holds for 1 to 2 seconds. Pull it off heat slightly thinner than you want, since it thickens as it cools.
  6. Remove from heat. If using wasanbon, sprinkle it over the surface and stir to dissolve.
  7. Cool in the pan for 20 minutes, then strain through a fine mesh sieve into a clean glass jar or squeeze bottle.
  8. Cool fully to room temperature before sealing and refrigerating.

Notes

  • Real Okinawan kurozato gives the most authentic mineral, smoky, slightly bitter flavor. Look for Tokunoshima, Tarama, or any Okinawan labeled kurozato.
  • The brown sugar version with molasses (and optional cocoa or espresso) is the closest pantry approximation. It tastes like a very good complex caramel syrup. The molasses carries the mineral depth, so do not skip it.
  • Trust the visual coat test over the timer. Fresh soft kurozato may need a couple of minutes less, older drier kurozato a couple more.
  • If overcooked syrup crystallizes hard in the fridge, warm the jar in hot water and stir in 1 to 2 tsp water to loosen.
  • Keeps 1 month refrigerated in a sealed jar. Warm the jar in hot water for 5 minutes to bring it back to a pourable consistency.

Nutrition

Find it online: https://zhangcatherine.com/kuromitsu/