neutral oil (I use sunflower oil)
First clean the onions and chop them. Now drizzle some oil in a pan and glaze the onions with the salt. Then weigh 90 grams of the glazed onion in a blender and also add the oil, the egg white, the sugar and the flour. Blend this. Now spread it on a silicon mold and then bake it at 150 degrees Celsius for 20 minutes. Remove the tuilles when still hot and if preferred dust some toasted onion powder on top.