The first part to making China's wildly popular hot sour soup, or Suan La Fen Tang, is getting the glassy noodles right. And all you need are 3 ingredients: mung bean flour, salt and water. No kneading and pulling of noodles are required. Here, simply slide a grater across the block of solid “gel”to create silky thin strands of glass noodles that you can drop into the wonderfully hot sour soup, or any soup at all really. It's clean-tasting and absorbs all flavours like a sponge.