Prep mise en place: rinse and pat the shrimp very dry (this helps them sear/steam evenly and prevents excess liquid), julienne the ginger, thinly slice the garlic and scallions, pick the cilantro leaves, trim shiitakes and slice if large, separate bok choy leaves and stack the parchment squares. Having everything ready shortens cook time and ensures precise timing for the parcels and noodles.

Make the ginger-soy dressing: in a small bowl combine 2 tbsp tamari, 2 tsp rice wine vinegar and 1 tsp sesame oil. Taste and add a pinch of salt or another 1/4 tsp soy if you like it saltier. This dressing will season both the shrimp parcels and be tossed with the soba so keep the balance bright (the vinegar lifts the soy; the sesame oil adds nuttiness).

Assemble the shrimp parcels: lay one 20 x 20 cm parchment square flat. Place 150 g shrimp (for one parcel) in the center in a single layer, scatter half the julienned ginger, 1 sliced garlic clove, and 1/2 sliced scallion over the shrimp. Drizzle with 1 tbsp tamari and 1 tsp rice wine vinegar (per parcel; see step 2) and 1/2 tsp sesame oil. Lightly season with pepper; you don’t need much salt because tamari is salty. Fold the parchment into a tight packet (fold edges over and roll to seal), leaving a small vent so steam can escape gently and cook shrimp evenly. Parcels concentrate the aromatics so the shrimp absorb the ginger-garlic flavor without being waterlogged.

Steam the parcels: bring a wide pot or wok with 2–3 cm of water to a steady simmer and place a steamer basket or rack over the water. Arrange the parcels on the rack, cover and steam for 6–8 minutes depending on shrimp size — steam until the shrimp are opaque, just pink, and firm to the touch (overcooking makes them rubbery). The gentle steam cooks the shrimp while the aromatics infuse them, keeping them very tender.

Blister the shiitake: while parcels steam, heat a heavy skillet over high heat until very hot. Add 1 tbsp neutral oil and swirl to coat. Add shiitake caps in a single layer and press them slightly; let them sizzle without moving for 60–90 seconds to develop a dark char, then flip and blister the other side 30–60 seconds. The high heat creates Maillard browning for deep umami; don’t overcrowd the pan or the mushrooms will steam instead of blistering.

Steam the bok choy leaves briefly (two ways): you can slip the leaves into the steamer with the parcels for the last 2–3 minutes, or quickly blanch them in boiling water for 30–45 seconds then plunge into ice water to preserve color. Steaming with parcels delivers a gentler cook and matches aromatics; blanching is faster and gives a crisper bite. Drain well if you blanched.

Cook the soba noodles: bring a large pot of water to a rolling boil. Add 140 g dry soba and cook according to package (usually 4–5 minutes) until just al dente. Stir once at the start so they don’t stick. Reserve 60 ml (1/4 cup) of the cooking water, then drain the noodles and immediately rinse under cold running water or plunge into an ice bath to stop cooking and remove surface starch — this preserves firm bite and prevents gummy clumps. Keeping the noodles slightly firm gives better texture against the tender shrimp.

Dress the soba: return drained soba to the pot or a warm bowl. Toss with the reserved 2 tsp sesame oil (from ingredients), 1 tbsp tamari (from step 2) and 1–2 tbsp of the reserved cooking water to loosen. Add half the sliced scallions and a pinch of black pepper. The hot (or warm) noodles will absorb the dressing — the reserved starchy water helps the sauce coat the strands without thinning the flavor.

Finish shrimp parcels and mushrooms: remove parcels from the steamer and carefully open (watch the steam). The shrimp should be plump and infused with ginger and garlic. Tuck the steamed bok choy leaves next to the shrimp if you steamed them together. Slice blisters if you prefer bite-sized pieces and toss the mushrooms briefly with a drizzle of remaining dressing (or a quick splash of soy + vinegar) to bring continuity of flavor.

Plate: divide the dressed soba between two bowls or shallow plates. Fan a few steamed bok choy leaves on top, place the gently opened shrimp parcel contents (or the whole parcel for presentation) on the noodles, and add blistered shiitake alongside. Scatter the remaining scallion, cilantro leaves and black sesame seeds over the dish. Finish with a lime wedge and an optional drizzle of chili oil for heat. A squeeze of lime brightens the soy and lifts the whole plate.

Final seasoning check: taste one bite and adjust with a pinch of flaky salt, extra tamari, or a squeeze of lime if needed. The balance should be savory (tamari), bright (vinegar + lime), and nutty (sesame oil + seeds).

Serve immediately while parcels and mushrooms are warm. Leftovers: keep noodles and shrimp separate and reheat gently; the parcels can be reheated in a covered pan with a little splash of water to create steam and prevent drying.