Simplest Steamed Sponge Cake (3种成分 蒸鸡蛋糕)

Traditional Way of making steamed sponge cake with 3 ingredients only. Ingredients (8" square mould) 100 g cake flour, sieved 80 g granulated sugar 4 eggs (about 200 g) 成分（8“方形模具） 100克低筋面粉，筛选 80克砂糖 4个鸡蛋（约200克） Please share this if you like it. Thank