Crispy shrimp tempura over rice is one of those high protein lunch boxes that makes you actually look forward to lunch. Crunch, protein, satisfaction.
Cook 2 cups of short-grain white rice using your preferred method, keeping it warm in a covered bowl.
Prepare the tempura batter by gently mixing 1 cup all-purpose flour, 2 tbsp cornstarch, 1 beaten egg, and 3/4 cup cold sparkling water; do not overmix to keep the batter light.
Pat the 10 large shrimp dry, dredge lightly in some extra flour (not listed), then dip into the batter one by one.
Heat 2 cups of vegetable oil in a deep pan to 350°F (175°C); fry the shrimp in batches for 2–3 minutes each until crisp and golden. Drain on a rack or paper towel.
In a small saucepan, combine 2 tbsp soy sauce, 1 tbsp mirin, 1 tsp sugar, and 1/4 cup dashi stock. Bring to a gentle simmer over medium heat, stirring until the sugar dissolves.
To assemble, divide the cooked rice between bowls, layer the crispy shrimp on top, and drizzle with the warm sauce right before serving.