In a bowl, combine the flour, starch, baking powder, seasoned salt, pepper, and optional cayenne pepper.
Gradually add water or a mixture of beer and soda water to the dry ingredients, mixing until you achieve a smooth batter.
Pat the shrimp dry and coat them thoroughly with the prepared batter.
Heat oil in a large wok to approximately 400°F (200°C).
Carefully add the battered shrimp to the hot oil and shallow fry until the batter starts to set.
2nd fry, Lower the oil temperature to about 350°F (175°C) and continue frying the shrimp until they turn golden and crispy.
Once cooked, remove the shrimp from the oil and let them drain on paper towels before serving.
