Walnut Shortbread
1.
Material collection diagram.
2.
Crush the walnuts and bake at 150°C for 10 minutes.
3.
Add a drop of white vinegar to the egg whites (you don't need to add the vinegar, and the vinegar will be beaten faster). Add the powdered sugar in two batches, and beat to nine to distribute.
4.
Stir in the chopped walnuts and sift the flour.
5.
Spoon the batter on the baking sheet. (I use oiled paper for the bottom. After the oven is out, the oiled paper is difficult to tear. You can consider using oiled cloth for the bottom).
6.
Preheat the oven up and down, roast the middle layer at 150°C for 25 minutes, roast at 120°C for 20 minutes, and simmer at the remaining temperature for 10 minutes.