2. Practice: Pour flour, baking soda, salt, eggs and cooking oil into a bowl and stir into a flocculent shape. Knead the dough and wake it for an hour.
3. Brush the dough with oil, cut it in half, press it into a cake, and make three cuts in the middle. Pour oil into the pan until it is 70% hot, add oil cake, fry on low heat until both sides are golden, and take out the pan.