Japanese

Chawanmushi (Thermomix TM6)

Savory Japanese egg custard — two eggs, 300 ml ichiban dashi, and a whisper of soy and mirin. Steamed in small cups at exactly 85 °C for twelve minutes. Silky, trembling, barely-set. The TM6's Varoma tray does what a bamboo steamer does, with absolute temperature control.

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Starter · Between Courses · Refined Small Plate
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Egg + optional shrimp/chicken/ginkgo
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4 × 150 ml cups
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30 min (12 min steam + rest)

The Most Difficult Easy Dish in Japanese Cuisine

Chawanmushi is a cup of seasoned dashi lightly set with egg. The ingredient list is four lines long and the recipe fits on a Post-it note: 300 ml first-pressing ichiban dashi, 2 eggs, 1 tsp soy, 1 tsp mirin, strained, poured into cups, steamed at 85 °C for 12 minutes. Garnished with a shrimp or a ginkgo nut or a single mitsuba leaf. Trembling, translucent, pale gold. One taste tells you why Japanese cuisine reveres this dish: the seasoned dashi comes through as the primary flavor, the egg functions as a barely-there setting agent, and the mouthfeel is closer to flan than to scrambled egg. It is pure umami in a custard form.

It is also the most temperamental dish in the classical Japanese home repertoire. The texture window is narrow: at 82 °C the custard is under-set and loose; at 90 °C it curdles into broken egg in liquid; at 85 °C it is perfect. The stovetop kettle-steamer every Japanese grandmother uses produces good results in skilled hands because the kettle's lid-pressure regulates steam temperature to roughly this range. Home cooks without the infrastructure get either under-set or curdled versions. The TM6's Varoma setting — precise temperature control + steam distribution from below — produces perfect chawanmushi every time because it holds the exact bath temperature the dish needs.

This recipe also closes a loop in the UMAMI corpus: UMAMI-5 #4 Dashi TM6 produces ichiban + niban; chawanmushi is the canonical application for ichiban where the dashi's clarity matters most. Niban would muddy the custard; ichiban keeps it pale gold. One jar of fresh ichiban yields 3 to 4 chawanmushi batches. This is the dish the dashi was made for.

Ingredients

for 4 × 150 ml cups

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Everyday

The Custard Base

2 large eggs (US large, ~50 g each without shell)
300 ml fresh ichiban dashi (from UMAMI-5 #4 Dashi TM6 — made within the last 48 hours for best quality)
1 tsp shoyu (Japanese soy sauce, NOT Chinese light soy)
1 tsp Hon mirin
1/4 tsp fine sea salt (taste dashi first — may already be seasoned enough)

Optional Garnish (One to Three of These)

4 raw shrimp, peeled and deveined (one per cup)
4 ginkgo nuts, soaked in warm water 15 min to soften (one per cup)
4 small mitsuba leaves (or shiso, or small parsley sprig)
4 thin slices kamaboko (Japanese fish cake) — optional, traditional
1 tbsp enoki mushrooms, cut into 3 cm lengths (optional)

Substitution Notes

No ichiban dashi made yet? Make the dashi first (UMAMI-5 #4). Shortcut: 300 ml hot water + 1 tsp Hondashi granules. Works but the chawanmushi will read as flatter than proper ichiban version.
No Hon mirin? Substitute 1 tsp sake + 1/4 tsp sugar. NOT 'mirin-style seasoning' (not real mirin).
No mitsuba? Flat-leaf parsley or baby cilantro are functional (not authentic) substitutes. Ginkgo not available? Skip it — most Western home cooks do.

No Limits

The Custard Base — Premium Dashi

2 large eggs from a high-quality producer (pastured, deep-orange yolks show well against pale-gold custard)
300 ml cold-soak overnight ichiban dashi (per UMAMI-5 #4 🔴 technique — overnight 4–12 h cold soak + 60 °C hold delivers 2× glutamate yield vs hot-only extraction)
1 tsp Yamaroku or Kishu artisan shoyu (Umami Mart)
1 tsp Sumiya Bunjiro Hon mirin (premium, not seasoning)
Pinch of Nuchi Masu sea salt

Traditional Garnish — Dinner Party Register

4 small shrimp from Honolulu Fish Co or Regiis Ova (raw; cook in the custard as it steams)
4 fresh ginkgo nuts (Umami Mart or Japanese grocery) — soaked in warm water 15 min to soften and peel
4 small mitsuba leaves (Japanese parsley — The Japanese Pantry or specialty Asian grocer)
4 slices kamaboko (traditional Japanese fish cake)
1 tbsp fresh enoki or maitake mushroom

Uni Finish (Dinner Party 🔴)

1 tbsp fresh sea urchin (uni) per cup — added AFTER steaming, as a raw topping on the finished custard. Source: Regalis Foods, Marky's Caviar Miami. Creates a two-temperature, two-texture dish that reads as modern kaiseki.

Mise en Place

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Dashi at room temperature (if freshly made, let cool to 40 °C before mixing with eggs — hot dashi will pre-cook the egg).
Eggs cracked into a medium bowl. DO NOT whisk vigorously — light stirring only (vigorous whisking introduces air bubbles that produce surface craters in the finished custard).
Soy, mirin, salt measured and ready.
Cups arranged on a tray. Garnish placed in the bottom of each cup if using (shrimp / ginkgo / enoki — the mitsuba leaf goes on top at the end).
TM6 bowl filled with water to the 1 L line — enough for steaming, not so much that water splashes into Varoma tray.

Method

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Prepare the Base — Gentleness Above All

If dashi is hot: cool to 40 °C (warm but not hot). Hot dashi combined with egg will pre-cook into tiny curdled bits, ruining the custard.

Crack 2 eggs into a medium bowl.

Stir gently with chopsticks or a whisk for 15 seconds — goal is to combine whites and yolks, NOT to aerate. Aggressive whisking introduces air bubbles that produce surface craters and texture imperfections.

Pour the 40 °C dashi into the egg. Stir gently to combine — 10 more seconds.

Add 1 tsp soy + 1 tsp mirin + pinch of salt. Stir once to distribute.

Taste the mixture before straining. It should read as mild, savory, umami-forward with a whisper of sweetness. If salty: the dashi was already seasoned; no additional salt needed. If flat: a pinch more soy (not salt).

Double Strain — The Restaurant Move

Set a fine-mesh sieve over a measuring pitcher or bowl.

First strain: pour the egg-dashi mixture through the sieve. The sieve catches chalazae (the thin ropes of egg white that anchor the yolk), any shell fragments, and large foam bubbles.

Second strain: rinse the sieve. Line it with cheesecloth (or a clean, unscented tea towel). Pour the first-strained mixture through the cheesecloth-lined sieve into a fresh pitcher.

The second strain catches micro-foam, residual chalazae, and fine particles that the first strain missed. The result is a mirror-smooth mixture.

Let the strained mixture rest 2 minutes on the counter. Any remaining surface foam will rise to the top and can be skimmed off with a spoon.

Cups, Garnish, Fill

Arrange 4 × 150 ml cups on a tray. Chawanmushi cups (traditional) have straight sides and small handles for hot-cup handling; standard ramekins work.

If using garnish that goes at the bottom: drop one raw shrimp, one softened ginkgo nut, and/or one small enoki-mushroom cluster into each cup.

Pour the double-strained custard mixture into each cup to within 1 cm of the rim (~130 ml per cup).

Gently tap each cup on the counter 2 to 3 times to release any remaining micro-bubbles.

Skim any surface foam with a paper towel touched lightly to the surface (capillary action pulls foam off without disturbing the custard).

Set Up TM6 Steam

Fill the TM6 bowl with water to the 1 L line. Too much water risks splashing into the Varoma tray; too little may run dry during the 12-minute steam.

Attach the Varoma tray on top of the TM6 bowl. Do NOT attach the Varoma lid yet — you need to place the cups first.

Set the TM6: 85 °C / Sp 1 / 15 min . (The extra 3 minutes beyond steam time accounts for the water reaching steam temperature.)

Let the water heat up for 3 to 4 minutes — steam should be rising vigorously from the bowl into the Varoma tray.

Open the Varoma tray, quickly arrange the filled cups in a single layer (do NOT stack cups; steam needs to circulate around each), close the Varoma lid.

Optional: before closing the Varoma lid, cover each cup with a small square of foil. Foil prevents condensation from dripping down into the custard from the Varoma lid. This produces a cleaner surface. Skilled cooks skip this; perfectionists use it.

The 12-Minute Steam

Once cups are in the Varoma and lid is on: reset the TM6 timer if needed to 12 minutes at 85 °C / Sp 1.

Do NOT open the Varoma during steaming. Every open costs 3 to 4 °C of Varoma internal temperature; recovery takes 90 seconds. A single check at 9 minutes is acceptable if temperature control is verified; two checks will produce under-steamed custard.

At 12 minutes: open the Varoma tray. The custard should have a matte surface (not shiny-wet), should wobble as one piece when the cup is gently shaken (not liquid in the center), and should have no visible liquid pooling on top.

Doneness test: insert a small paring knife or toothpick into the center of one cup. When withdrawn, it should be clean or have only a slight film — no liquid egg. If liquid egg is visible: 2 to 3 more minutes of steam.

Over-steaming indicators: surface has pulled away from cup edges and looks cracked; custard has rubber-like feel when tapped. Not recoverable — next batch, pull at 11 minutes.

Finish + Serve

Once doneness is confirmed: carefully lift each cup from the Varoma using tongs or silicone grips (cups are hot).

Place each cup on a small serving plate (small ceramic plate or lacquered wooden square).

Finish each cup: lay one mitsuba leaf on top of the custard. The leaf floats visibly.

(🔴 uni option): drop 1 tbsp fresh uni on top of the custard. The cold uni against the hot custard creates a two-temperature contrast that is pure modern kaiseki.

Serve IMMEDIATELY. Chawanmushi loses its peak quality within 5 minutes of steaming — the custard continues to firm up from residual heat and can over-set.

Eating technique: use a small spoon. Dig straight down to the bottom of the cup and scoop — each bite should contain custard + garnish from the bottom. No stirring.

Timeline

T=0 — Mix base gently Eggs + dashi (at 40 °C) + soy + mirin + salt. Stir gently with chopsticks or whisk for 15 sec — JUST to combine, not to aerate.
T+2 — Double strain First strain: through fine-mesh sieve into a pitcher. Second strain: through cheesecloth-lined sieve into a second pitcher. Removes chalazae, foam, micro-bubbles.
T+5 — Fill cups If using bottom garnish (shrimp, ginkgo): pre-place in each cup. Pour strained custard mixture into cups to within 1 cm of the rim. ~130 ml per cup.
T+7 — Set up TM6 steam Water to 1 L in TM6 bowl. Varoma tray on top. Set TM6: 85 °C / Sp 1 / 12 min. Begin heating.
T+10 — Water at steam Water reaches 85 °C and begins to produce steam. Open Varoma tray, arrange cups in a single layer (don't stack). Cover cups loosely with foil if condensation is a concern.
T+10:00–22:00 — Steam 12 min Close Varoma tray. TM6 holds 85 °C steady. Do NOT open during steaming (lose 3–4 °C every open).
T+22 — Test doneness Open Varoma. Gently shake one cup — the custard should wobble uniformly (like panna cotta) but not be liquid in the center. A knife inserted into the center and withdrawn should emerge clean.
T+23 — Add mitsuba + finish Garnish each cup with 1 mitsuba leaf on top. (🔴) Drop 1 tbsp uni on top of finished custard.
T+25 — Serve Serve HOT in the cups. Eat with a small spoon. Pair with chilled junmai sake.