Japanese Kake-udon and Udon Broth Regional Architecture

Ingredients

• For the noodles
• 400 g dried udon noodles, or 800 g fresh; Sanuki style preferred
• For the Kansai kake-jiru (pale broth)
• 1.2 litres cold water
• 20 g kombu, wiped clean with a damp cloth; do not rinse
• 15 g katsuobushi, fine-shaved; secondary role only in Kansai style
• 40 ml usukuchi soy sauce, light-coloured; use less volume than instinct suggests
• 30 ml mirin, bring briefly to the boil to drive off alcohol before adding
• For the Kantō kake-jiru (dark broth — alternative)
• 1.2 litres cold water
• 10 g kombu, wiped clean; subordinate role in Kantō style
• 40 g arakezuri katsuobushi, thick-shaved; forward, assertive dashi character
• 60 ml tamari or dark soy sauce
• 30 ml mirin, bring briefly to the boil before adding
• To finish and serve
• 2 spring onions, finely sliced on the diagonal
• 4 g fine-shaved katsuobushi, for Kansai bowls only; optional garnish

Method

1. 1
   Make the dashi fresh per service. For Kansai-style: place kombu in cold water and bring slowly to just below a simmer; remove kombu before the water boils. Add fine-shaved katsuobushi, bring briefly to the boil, remove from heat, and steep for two minutes. Strain immediately through a fine cloth without pressing. The dashi is ready when it is clear and pale gold, with clean kombu-sweet aroma and no muddiness.
2. 2
   For Kantō-style dashi: place kombu in cold water and bring to just below a simmer; remove kombu. Add arakezuri katsuobushi, bring to the boil, steep for three to four minutes to extract forward katsuobushi character. Strain without pressing. The dashi is ready when it carries a deep, assertive katsuobushi aroma and the liquid is clear amber.
3. 3
   Season the strained dashi into kake-jiru. For Kansai: add mirin (brought to the boil separately to drive off alcohol) and usukuchi soy sauce in restrained volume — the sodium content of usukuchi is double that of regular soy; the finished broth colour must remain pale gold. For Kantō: add mirin and tamari or dark soy; the finished colour should be deep amber and the salt character pronounced. Taste, adjust. This is where the dish lives or dies: the broth balance — the ratio of dashi sweetness, soy salinity, and mirin warmth — cannot be corrected once the noodles are in the bowl.
4. 4
   Bring a large volume of unsalted water to a rolling boil. Add the udon noodles and cook according to the noodle type — dried udon requires eight to twelve minutes; fresh udon two to three minutes. The noodles are ready when they offer a slight resistance at the core under firm bite; fully soft noodles are overcooked by Japanese standards.
5. 5
   Drain the cooked noodles and rinse thoroughly under cold running water, working through the strands to remove all surface starch. Insufficient rinsing leaves residual starch that clouds the carefully made broth on contact. The noodles are ready when the rinsing water runs completely clear and the noodle surface feels smooth and clean.
6. 6
   Bring the kake-jiru to a minimum of 90°C before service. Warm the serving bowls. Reheat the rinsed noodles by submerging briefly in boiling water for thirty seconds, then drain. Place the noodles in the warmed bowls and ladle the broth over in generous volume — the noodles must be completely submerged, not sitting in a shallow puddle. Garnish with sliced spring onion. The bowl is ready when steam rises steadily from the surface; a still surface signals insufficient broth temperature and a compromised eating experience.