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Japanese · Tokyo

Japanese Tempura Dipping Sauce: Tentsuyu Architecture and the Dashi Ratio

Tentsuyu — the warm dashi-mirin-soy dipping sauce served with tempura — is one of Japanese cuisine's most precisely calibrated composed sauces, its ratio and temperature designed to complement rather than compete with the delicate oil-and-batter character of freshly fried tempura. The standard tentsuyu ratio is 4:1:1 (dashi:mirin:soy sauce) — approximately 400ml ichiban dashi to 100ml each of mirin and soy, with the mirin brought to a simmer first to cook off alcohol before blending. The dashi base is typically ichiban dashi (primary dashi of konbu and katsuo) for maximum clarity; some traditions use konbu-only dashi for lighter expression with vegetable tempura. The sauce is served warm — close to 60°C — so that it doesn't shock the hot tempura and doesn't cause the batter to absorb liquid too quickly. Grated daikon and grated ginger are classical accompaniments, added by the diner to the tentsuyu rather than pre-mixed. Daikon adds enzymatic activity (amylase and lipase that aid oil digestion), freshness, and cool contrast; ginger adds aromatics and warmth. Regional variations exist: in Osaka, tentsuyu tends toward sweeter (more mirin); in Kanto, it is more savoury. Some tempura-ya use a finished tare reduction and reconstitute to order with fresh dashi — ensuring consistent flavour regardless of dashi batch variation. The tentsuyu bowl itself (usually a small wide porcelain vessel) is chosen for heat retention and aesthetic complement to the tempura arrangement.

ServesFour portions
Sourced3of 8 in BC
Cook
I

The Market List

The benchmark for each ingredient, and who stocks it near you. Tap a stockist to go straight to the product.

For the ichiban dashi
500 ml
cold water
filtered for clarity
Your own market
10 g
konbu
wiped clean with a dry cloth, not rinsed
Not yet stocked in British Columbia
15 g
katsuobushi (bonito flakes)
added off the heat; steeped briefly
Origin · United StatesNot yet stocked in British Columbia
For the tentsuyu
400 ml
ichiban dashi
strained clear
Not yet stocked in British Columbia
100 ml
mirin
simmered first to drive off alcohol
Not yet stocked in British Columbia
100 ml
To serve
60 g
daikon
grated fresh by the diner at the table
Origin · JapanT Amano Trading · Vancouver →
20 g
fresh ginger
grated fresh by the diner at the table
Origin · New ZealandPurely Artisan Foods · San Diego →

Each tap is counted, so the stockist sees the demand Provenance sends them.

II

The Method

1
Place the konbu in cold water in a small saucepan. Bring slowly to just below a simmer over medium-low heat; remove the konbu when the water reaches approximately 60°C and small bubbles begin to rise from the base of the pan. Raise the heat, bring the liquid to a full simmer, then remove from the heat. Add the katsuobushi in a single addition; steep undisturbed for 2 minutes. Strain through a fine-mesh cloth without pressing. The resulting ichiban dashi must be pale gold and fully transparent — any cloudiness indicates the konbu was boiled or the katsuobushi was agitated.
From the canon — The foundational liquid of Japanese cooking — a clear, pale gold broth of extraordinary delicacy made from kombu and katsuobushi in under five minutes. Ichiban Dashi (Primary Dashi) →
2
Pour the mirin into a small saucepan and bring to a gentle simmer over medium heat. Hold at a simmer for 1–2 minutes to cook off the alcohol. Do not reduce significantly — the mirin should remain fluid and pale, not syrupy. This is where the dish lives or dies: over-reduction at this stage creates excessive sweetness that will overwhelm the clarity of the dashi in the finished tentsuyu, and cannot be corrected.
3
Combine the simmered mirin, soy sauce, and ichiban dashi in the saucepan. Warm together over low heat, stirring once to blend. Bring to approximately 60°C — the sauce should steam gently and feel warm but not hot when the bowl exterior is held briefly. Do not boil: boiling will drive off volatile dashi aromatics and deepen the soy beyond the intended register.
4
Ladle the warm tentsuyu into individual small, wide porcelain bowls chosen for heat retention. Serve immediately alongside freshly fried tempura. Present grated daikon and grated ginger separately for each diner to add to their own bowl — pre-mixing dilutes and cools the sauce and is a common error. The sauce at the table should still steam faintly: this signals correct serving temperature.
III

Quality Hierarchy

01
Reserve — Ichiban dashi drawn from single-origin konbu (Rishiri or Rausu) and hon-karebushi katsuobushi aged over 60 days; aged tamari in place of standard soy; Kyoto-style mirin (hon-mirin) from sweet rice. The ratio held to 4:1:1 with laboratory precision.
02
Estate — Good-quality hon-mirin; name-branded naturally brewed soy sauce (Kikkoman or equivalent); konbu from a known growing region. Katsuobushi of standard thickness, freshly opened. The dashi strained through fine cloth.
03
Market — Standard dashi packet (dashi-no-moto) reconstituted carefully to strength; commercial mirin and soy of reliable quality. Daikon freshly grated. The ratio observed correctly even if the base ingredients are modest.
04
House — Instant dashi granules; mirin-style seasoning (aji-mirin) rather than true hon-mirin; soy sauce of any available brand. The sauce will lack the clarity and clean dashi-forward finish of the higher rungs but remains functional at the correct temperature and ratio.
IV

Sensory Tests

◇Sight. Ichiban dashi is pale gold and fully transparent when held to light — cloudiness disqualifies it.
◇Smell. Simmered mirin smells of cooked sweetness with no sharp alcohol edge — the raw spirit note must be absent before proceeding.
◇Touch. The exterior of the filled tentsuyu bowl is warm and comfortable to hold briefly — not cold, not too hot to grip — indicating a service temperature close to 60°C.
◇Sight. The finished tentsuyu steams faintly in the bowl at the table — visible steam confirms the thermal window that prevents rapid batter absorption.
◇Where it lives or dies. The mirin simmer must be controlled precisely — over-reduction creates irreversible sweetness that overwhelms dashi clarity.
Pillar V
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The dishes this one teaches you, across the cuisines — on every recipe.
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VI

What to Pour

The pairing
Nikka From The Barrel
Nikka Whisky — Miyagikyo Distillery · Miyagikyo — Nikka Distillery
Not yet stocked in British Columbia
Whisky
From British Columbia
Fort Berens Riesling
Fort Berens Estate Winery · Lillooet
Not yet stocked in British Columbia
Wine
Without alcohol
GT's Synergy Organic Kombucha — Gingerade
Not yet stocked in British Columbia
Non-alcoholic

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The whole pairing
Pillar VII
Origin and lineage are part of membership.
Where the dish comes from and how it came to be — on every recipe.
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Sourced through Provenance

The hands behind the plate.

Purely Artisan Foods
San Diego · soy sauce, fresh ginger
→
T Amano Trading
Vancouver · daikon
→