1poundshrimp large about 15, shell and head removed, tail on, deveined
4tablespoonspotato starch
1/2teaspoonfine sea salt
1cupall-purpose flour
1egglarge
1cupsparkling waterclub soda, ice-cold
4cupsneutral oilfor frying
1teaspoonfresh grated gingeroptional
2tablespoonsgreen onionthinly sliced (optional)
Quick dipping sauce
1/4cupsoy sauce
3tablespoonsmirin
2tablespoonswateror dashi
1teaspoonsugar
Instructions
Pat the cleaned, tail-on shrimp very dry with paper towels.
Make 3 to 4 shallow slits on the belly side of each shrimp, then gently press along the length to straighten.
Stir 2 tablespoons potato starch with 1/4 teaspoon salt. Lightly dust the shrimp and shake off the excess.
Make the dipping sauce by combining soy sauce, mirin, and water or dashi with sugar in a small saucepan. Warm just until the sugar dissolves. Set aside.
In a medium bowl, whisk the egg with the ice-cold sparkling water. Sift in the flour, 2 tablespoons potato starch, and 1/4 teaspoon salt. Stir just until moistened. Keep the bowl over ice to stay cold.
Heat 2 inches of oil in a heavy pot to 350°F. Skim any surface crumbs as you fry.
Holding by the tail, dip each shrimp into the batter, let the extra drip off, then slide it into the hot oil. Fry in small batches for 1½ to 2 minutes until pale golden, crisp, and the shrimp is opaque.
Transfer to a wire rack or paper towel to drain. Repeat with remaining shrimp.
Serve hot with the dipping sauce and garnish with ginger and green onion if you like.