Shrimp Cakes with Wasabi Vinaigrette

Preparation

1. Make dashi:

   Step 1

   Wipe any sand or salt from kombu with a dampened cloth.

   Step 2

   Bring water and kombu almost to a boil in a 2-quart saucepan, then reduce heat and simmer, uncovered, 5 minutes. Add katsuo bushi and bring to a boil, then boil 30 seconds. Remove from heat and let stand 3 minutes, skimming any foam. Pour dashi through a cheesecloth-lined sieve into a bowl.

2. Make shrimp mixture:

   Step 3

   Cook carrot, onion, and mushrooms in 1/4 cup dashi, uncovered, in a small heavy skillet over moderate heat, stirring frequently, until carrot and onion are softened, about 4 minutes. Cool slightly.

   Step 4

   Stir together shrimp, fish, vegetable mixture, yolk, sea salt, shoyu, and sugar in a bowl until combined well, then knead with your hands to form a paste. Chill, covered, until cold, about 1 hour.

3. Make wasabi vinaigrette:

   Step 5

   Whisk together wasabi paste and mayonnaise, then add mirin and rice vinegar in a slow stream, whisking until blended well. Season with white pepper.

4. Make mirin sauce:

   Step 6

   Bring mirin, shoyu, sugar, and 1/4 cup dashi to a simmer in a small saucepan. Stir cornstarch mixture, then whisk into mirin mixture and boil, whisking, 1 minute. Remove from heat and keep warm, covered.

5. Fry shrimp cakes:

   Step 7

   Heat oil in a deep 10-inch skillet over moderate heat until it registers 250°F on thermometer. While oil is heating, form shrimp mixture into 4 (1/2-inch-thick) cakes. Fry cakes until light golden, about 2 minutes on each side, then transfer with a wide metal spatula to paper towels to drain. Transfer cakes with spatula to clean paper towels to drain again. Cut each cake into 1/2-inch-wide slices.

6. Assemble dishes:

   Step 8

   Divide mesclun among 4 plates and sprinkle with shiso leaves. Arrange shrimp cake slices over salads and drizzle with vinaigrette and mirin sauce. Top each serving with 2 rounded tablespoons katsuo bushi, then with sprouts.