In a mixing bowl, add rice flour, eggs, 1 tsp turmeric powder, 250ml water, ½ tsp salt and chopped spring onion. Stir well and let batter rest for 30min.
In a pan on medium-high heat, stir-fry prawns with 1 tsp salt, 1 tsp white pepper and minced garlic for 3-4min, until prawns are fully cooked. Remove from pan and set aside.
In a separate pan on medium-high heat, heat 1 tbsp oil evenly around the pan. Ladle a small amount batter and tilt the panin a circular motion to spread the batter evenly. It should be a thin layer.
Add 3 tbsp prawns and a handful of beansprouts. Cover pan and let it cook for 1min.
Fold the crepe in half and fryfor 1 more minute and transfer to a plate. Repeat until you finish the batter and filling.
In a bowl, combine 2 tbsp sugar, 2 tbsp fish sauce, lime juice and 10 tbsp water together and stir well to dissolve sugar.
Transfer the filled crepe into serving plate and serve with fresh greens and dipping sauce on the side.