Combine the
flour. rice flour, cornflour, eggs, water, salt and pepper in a food
processor. Process for 1 minute or until smooth. Pour the batter into a
bowl. Add the sweet potato, spring onion, garlic and bean sprouts and mix
well. Heat 1-2 cm oil in a pan. Using 2 spoons, push about 1 tbsp of the
mixture into the oil. Place a prawn on each fritter as it cooks. Cook each
fritter for 2 minutes or until golden brown. Remove from the pan and drain
on paper towels. Repeat with the remaining mixture and prawns. Serve
immediately with a dipping sauce.
To make dipping
sauce: Combine the vinegar, water, garlic and salt in a bowl and whisk to
combine.