How to Make It
In a mortar, pound the chiles, garlic and sugar to a paste. Stir in the fish sauce, lime juice and water.
In a bowl, whisk together the rice flour and 2 cups of cold water. Mix in the turmeric and scallion.
In a large nonstick skillet, heat 1 1/2 tablespoons of the vegetable oil over high heat. Add 3 slices of pork, 3 shrimp and a few slices of onion and mushroom. Season with 1/8 teaspoon each of salt and pepper. Cook for 1 minute. Stir the rice flour mixture again and ladle 1/3 cup into the pan; tilt the pan to evenly distribute the batter. Cover and cook until the sides of the pancake turn deep brown and curl up, 5 minutes. Scatter 1/4 cup of the bean sprouts over the pancake, fold it in half and slide it onto a warm platter. Keep warm in a low oven while you repeat with the remaining ingredients. Serve the pancakes warm, with the dipping sauce on the side.