Cooking Steps

1. 

   Step1:Butter softens. Break it u

2. 

   Step2:Gradually put in the sugar. Gradually mi

3. 

   Step3:Gradually put in the yolk. Mix wel

4. 

   Step4:Sift in low gluten flour. Mix wel

5. 

   Step5:Preheat the oven at 160 ℃ for 10 minutes. Bake the middle layer for 75 minutes.