Shrimp Tempura Batter

2 cups all-purpose flour
2 tablespoons baking powder
1 teaspoon salt
1 1/2 cups ice cold water
1/4 cup cornstarch
1 teaspoon baking soda
2 eggs, slightly beaten
Shrimp, peeled, cleaned, patted dry

Combine flour, cornstarch, baking powder and baking soda in a bowl. Add salt, egg and water; stir until flour is moistened. Batter should be slightly lumpy. Dip shrimp in batter. Deep fry.