Japanese Miso Soup Customisation Tonjiru and Regional Variants

Ingredients

• For the dashi
• 1 piece (10 g) kombu, wiped clean with a damp cloth
• 15 g katsuobushi (bonito flakes)
• 1 litre cold water
• For the tonjiru
• 200 g pork belly or pork shoulder, sliced thin, 3–4 mm
• 150 g daikon, peeled, cut into half-moons 5 mm thick
• 1 medium (100 g) carrot, peeled, cut into half-moons 5 mm thick
• 100 g burdock root (gobo), scrubbed, shaved or cut into oblique pieces, soaked in cold water
• 150 g taro (satoimo), peeled, cut into bite-sized pieces
• 100 g konnyaku, torn into rough pieces by hand, blanched briefly
• 150 g silken tofu, cut into 2 cm cubes
• For the miso
• 5 tbsp (approx. 80–90 g) darker miso (aka miso or Shinshu miso), or blended aka and shiro; adjust to taste — 1 tbsp per 200 ml dashi is the calibration
• To garnish
• 1 small bunch mitsuba or Japanese green onion (negi), finely chopped or torn; added immediately before service
• 1 small strip yuzu zest, optional; pare fine strips at service

Method

1. 1
   Combine the kombu and cold water in a medium saucepan. Bring slowly over low-medium heat. Remove the kombu just before the water reaches a full boil — small bubbles will form at its edges and a faint marine scent will rise from the pot. Add the katsuobushi, allow it to steep off the heat for 3–4 minutes, then strain through a fine sieve. The finished dashi should be pale gold and clean-smelling; cloudiness indicates the kombu boiled too long.
2. 2
   Return the dashi to the pot over medium heat. Add the pork slices, daikon, carrot, burdock, taro, and konnyaku. Bring to a gentle simmer. Skim any foam that rises during the first few minutes. Simmer uncovered for 15–20 minutes until all root vegetables yield without resistance to the tip of a chopstick or knife point.
3. 3
   Taste the broth before any miso is added. The pork and vegetables will have released salt and umami during simmering; this tasting determines how much miso the soup actually requires. Add the silken tofu cubes and warm gently for 1–2 minutes only — the tofu needs no more than gentle heat; prolonged cooking produces a rubbery, pitted texture.
4. 4
   This is where the dish lives or dies. Reduce the heat to its lowest setting or remove the pot from the heat entirely. Dissolve the miso by placing it in a ladle, submerging the ladle in the hot broth, and pressing the paste through the ladle with a spoon or chopstick until it disperses completely. The soup must not boil again once the miso enters the pot. The aromatic volatiles that distinguish quality miso — the compounds built through months of fermentation — evaporate irreversibly above 85°C. The surface should show a very faint, slow movement: warmth, not agitation.
5. 5
   Warm the serving bowls by filling them briefly with hot water, then emptying them immediately before ladling in the soup. Ladle the tonjiru into the warmed bowls, ensuring each portion receives a share of all vegetables, pork, and tofu. Scatter mitsuba or chopped green onion directly over the surface, and add yuzu zest if using. Serve immediately — miso soup loses heat rapidly in any vessel and must arrive at the table hot.