Preheat your frying pan to 190ºC - 375ºF or heat the neutral oil in a middle-sized pan on a medium heat (see notes). If you do not have a deep fat fryer or a thermometer to check the temperature, throw in a piece of bread or potato, once it's turned golden brown the oil will be at the right temperature.
In one bowl, mix 1 T of the self raising flour with the drained and dried gigantes or butter beans. This well make them extra dry and help adhere the batter to the beans.
Mix the remainder of the self raising flour with 2 t of smoked paprika, 1 1/2 t of dried oregano, 1 1/2 t of garlic powder and salt and pepper to taste before slowly pouring in the sparkling water. Start with about 150 ml of the sparkling water and slowly add more until your batter has reached the consistency of thick cream.
Gently fold the beans into the batter so they are evenly coated and lined a big plate with some paper kitchen towel.
Scoop about a quarter of the beans into the hot oil with a slotted spoon and allow to fry golden brown and crisp. This should take 2 minutes or so.
Scoop the beans out of the oil and process the remainder of the beans in the same manner. Avoid overcrowding the pan, Georgina writes to fry in four batches, and don't fry them too long or the beans may explode.
Sprinkle some additional salt and oregano over the top and serve with a nice cold drink.