For the pancake batter, place the rice flour, cornflour, sea salt and turmeric into a bowl.
Gradually whisk in the soda water and coconut milk until smooth. Leave to rest for 10 minutes.
Heat a pan over a medium-high heat and add the vegetable oil.
Add the onion and cook for 2 minutes until softened.
Add the pork mince and cook until lightly coloured.
Add the prawns with the mushrooms and a little sea salt. Stir fry for 2–3 minutes.
Add the beansprouts and cook briefly until just softened. Remove the filling from the pan and keep warm.
Wipe the pan clean and return to a medium heat.
Pour in a ladle of batter and swirl to coat the base thinly. Cook until the pancake begins to crisp around the edges.
Spoon some filling onto one half of the pancake, then fold over and cook for a further minute until crisp and golden.
Repeat with the remaining batter and filling.
Serve with salad leaves and fresh coriander.