Shimeji Mushrooms Tempura Recipe

Prepare mushrooms

Trim the base of the shimeji clusters so they separate into small clusters but remain attached enough to handle. Pat dry gently with paper towel to remove excess moisture. Toss the clusters lightly in 2 tablespoons cornstarch to coat; shake off excess. This helps the batter cling.

Heat oil

Pour vegetable oil into a deep pot or heavy saucepan to a depth of about 3–4 inches (enough for deep-frying). Heat over medium-high until the oil temperature reaches 175°C (350°F). If you don't have a thermometer, test by dropping a small pinch of batter — it should sizzle and float immediately.

Make batter

Place 1 cup all-purpose flour, 1/4 cup rice flour, and 1 teaspoon kosher salt in a bowl and whisk briefly to combine. In a separate chilled bowl, whisk the egg yolk lightly, then add 1 cup ice-cold sparkling water. Pour the wet into the dry and stir with chopsticks or a fork just until combined — the batter should be lumpy and cold. Do not overmix; some streaks of flour are okay. Keep the batter in an ice bath if your kitchen is warm to maintain chill.

Fry mushrooms

Working in small batches (to avoid crowding), dip each shimeji cluster into the batter, allowing excess to drip off, then carefully slide into the hot oil. Fry 2–4 clusters at a time for about 2–3 minutes, turning gently so they brown evenly and the batter becomes crisp and pale golden. Use a spider skimmer to remove and drain on a wire rack set over a sheet tray or on paper towels. While frying remaining batches, keep the oil temperature steady at 170–180°C (340–355°F).

Season

While still hot, sprinkle the tempura with a light pinch of fine sea salt or finishing salt. This enhances flavor right away.

Make the dressing: In a small bowl or jar combine 2 tablespoons light soy sauce, 1 tablespoon mirin, 1 tablespoon rice vinegar, 2 tablespoons neutral oil, 1/2 teaspoon truffle oil, 1/2 teaspoon sesame oil, 1 teaspoon honey, 1 teaspoon grated fresh ginger, and 1/2 teaspoon finely minced garlic. Whisk or shake until emulsified. Add the white part (or half) of the thinly sliced scallion into the dressing. Taste and adjust: if too salty, add 1/2 teaspoon more honey or 1/2 teaspoon water; if too sharp, add a few drops more neutral oil. Finish with 1/4 teaspoon freshly ground black pepper.

Keep the dressing chilled until service. Warm tempura is best paired with cool dressing poured sparingly or served on the side for dipping.

Assemble: Arrange the fried shimeji tempura on a platter or individual plates. Drizzle a light amount of soy–truffle dressing over the tempura (about 1 teaspoon per serving) or serve the dressing in a small ramekin alongside for dipping.

Garnish: Scatter the remaining thinly sliced scallion tops and 1 teaspoon toasted sesame seeds over the tempura. Serve immediately with lemon wedges on the side to squeeze lightly if desired.

Yield & storage: Serves immediately for best crispness. Leftover batter should be discarded. If you must reheat cooked tempura, flash-reheat in a 200°C (400°F) oven on a rack for 3–5 minutes to restore crispness; do not microwave.