As for the filling is really up to you what you like to pull in. Personally I love chive or green spring onion.
Self raising flour
Rice flour (to produce crispness)
Slash of Pepper
Green spring onion
Mix all items in batter. The consistency of batter should not be too liquid but lumpy.
I made three round fritters with four tablespoon of self raising flour, 1 teaspoon of rice flour, less than half teaspoon of salt/sugar, pepper and water to mix to lumpy consistency of batter.
Put in the chopped green spring onion and mix well.
On the wok, heat the oil. Coup two tablespoon of batter on to heated metal spatula. Place two prawns on top of the batter. Lift the metal spatula down to heated oil. Left it on until fritterself release from spatula. Let the fritter cook until lightly brown and turn to the other side until brown.