In a large bowl, mix together rice flour, cornstarch, turmeric powder, sugar, salt, beer, coconut milk, warm water, and green onions. Set it aside and let it rest for at least 30 minutes to "bloom".
Heat the frying pan on medium-high heat until hot. Add oil, 2 to 4 shrimps, 2 to 3 slices of pork belly, and a few slices of onions. Saute for 2-3 minutes until shrimp and pork are fully cooked.
Add about ½ cup of batter, lift the pan, and move your wrist in a circular motion to quickly swirl the batter around to spread the batter evenly across the entire pan. Cook for 3-4 minutes.
Drizzle a little oil all around the edge of the pan. Add a handful of bean sprouts and a tablespoon of mung beans to the top half of the crepe. Fold the unfilled portion of the crepe in half.