In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Q: Butter cakes are often made by beating the butter and sugar until fluffy .
A: 
Butter cakes are traditionally made using a creaming method , in which the butter and sugar are first beaten until fluffy to incorporate air into the butter .