In a mixing bowl, combine tempura flour, white pepper, rosdee seasoning powder, and salt. Slowly add ice-cold water, stirring continuously until the mixture is smooth.
1/2 teaspoon salt, 1/4 teaspoon white pepper, 1/2 teaspoon rosdee seasoning powder, 2 oz or 1/2 cup tempura flour, 1/2 cup ice cold water