The pre-timeskip it was the Anti-Manners Kick Course:
As for the post-timeskip, in my opinion, even though we haven't seen Sanji's full power yet perhaps it could be his Hell Memories cause think about, he remebering the painful time he spent at the Kamabakka Kingdom for the past two years and his putting all of that hate into this one powerful kick that sets his opponents completely on fire:
What do you guys think?
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As for the post-timeskip, in my opinion, even though we haven't seen Sanji's full power yet perhaps it could be his Hell Memories cause think about, he remebering the painful time he spent at the Kamabakka Kingdom for the past two years and his putting all of that hate into this one powerful kick that sets his opponents completely on fire:
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What do you guys think?