Soften butter under room temperature. Stir butter to cream shape in a mixing bowl. Add sugar, whisk until mixture changes to lighter colour. Stir in beaten egg yolk. Mix well.
牛油于室温放至软化，放进不锈钢盆内，用木匙压至油状，加入砂糖，以达蛋器打至奶白色，加入打散的蛋黄搅匀。
Soften the butter in room temperature. Whisk with sugar in a large bowl, until they turn white and just hold soft peaks.
奶油在室温中软化后，取大碗加糖一起打发，略微发白。
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