1. In a bowl, whisk together flour, salt, baking soda, and baking powder. Combine the water, egg white, and oil and pour that into the flour mixture.
2. Mix until a shaggy dough comes together then knead it for 6-8 minutes until the dough stops sticking to your hand.
3. Let the dough rest for 30 minutes, then flatten it out and roll it into a log shape. Cover and let the dough rest overnight.
4. The next day, flatten the dough into a rectangle shape and cut it into 16-18 even strips.
5. Wet a chopstick and draw a line down the middle of every other dough strip. Stack one strip on top of the other and press down the middle using a chopstick.
6. Evenly stretch out the dough and deep fry in oil set at 390 degrees Fahrenheit. Let it fry for 1 minute on each side until puffed up and golden brown.
7. Enjoy with soy milk, pho, or congee.
