I strongly recommend using an electric whisk for this.
2
取一大盆,用电动打蛋器打发黄油和白糖,至羽毛状,再打入鸡蛋和薄荷精华。
In large bowl, beat butter with sugar until fluffy; beat in egg and peppermint.
3
要达到这种程度,需要一边用打蛋器或电动搅拌机搅打碗里的蛋黄,一边慢慢儿加糖,要持续搅打2到3分钟。
To accomplish it, add the sugar gradually to the egg yolks in a mixing bowl while beating with a wire whip or an electric beater; continue beating for 2 to 3 minutes.