First cut the onions in half and clean them. Now slice them in thin slices. Then add a drizzle of oil to a cold pan and glaze the onion on the lowest heat till they have completely softened.
Meanwhile take the onion peels and toast them with a blowtorch for a good smokey flavor. Let them dry at 50 °C for a couple of hours.
Once dry transfer it into a blender and blend it into a fine powder. Set it aside for later.
When the onions have softened weigh 135 grams into a blender and also add the egg white, the sunflower oil, the sugar and the salt. Blend this till smooth.
Then add the flour and blend it once more.
Now set half of the batter aside for later and add a tablespoon of the toasted onion powder to the remaining batter. Blend this for another 30 seconds.
Then spread it on a taco mold. Click here for more info. Level it and then bake it at 160 °C for 8 minutes. After that let it cool down before adding a thin layer of the neutral batter. Level it and then bake it for around 12 minutes till golden brown.
Now when still hot cut it with a round cutter.
Then heat them up once more and use a taco stand holder to shape the tacos. Keep them dry and covered for later.
