2. Put the beef slices into a bowl, then pour in corn starch, salt and a little water and mix well, then add baking soda and mix well, and finally pour in an appropriate amount of cooking oil and mix well for half an hour.
3. Pour the right amount of oil into the pot and heat it on low heat. Add Pixian bean paste and stir-fry red oil, then pour in Chili powder and stir-fry evenly.
4. Then pour half a pot of water and adjust the fire to boil. Blanch the lettuce slices in the pot and take them out for later use.
5. Continue to heat the soup in the pot, and then put the beef slices into the pot in turn.
6. Because beef is easy to cook, it takes about 10 second to cook. When you see the discoloration of beef slices, you can turn off the fire and water the starch immediately to make the soup thicker and smoother.
7. Take out the pot and put it in the bowl. Pour the cooked lettuce slices into the pot, then add the minced onion and garlic, Chili powder and pepper powder, and then heat some hot oil to pour it.