1. Cut the butter into small pieces, put it in a milk pan and heat it until small bubbles bubbling around;
2. Sift in the flour, cut and mix evenly;
3. Add milk in portions and mix well;
4. Add egg yolks in portions and mix well;
5. Add a little salt and a few drops of lemon juice to the 3 egg whites, add sugar in two portions, and beat until stiff foaming;
6. Take part of the egg whites into the egg yolk batter, cut and mix evenly, and finally mix with all the egg whites and mix well;
7. Pour the 7-inch non-stick Cuckoo Hoff mold in the school kitchen. Bake in the oven at 140 degrees for 50 minutes.
Tips:1. When heating the butter, observe it at any time to avoid scorching;
2. Please refer to your own oven for specific time and temperature. I cannot open the oven door in the middle of my oven to avoid over-coloring. I chose slow baking at low temperature, which tastes better.
