Make Gimbap cutter

Haskell, 32 bytes

f(')':s)=f s
f s=do ')'<-s;"@) "

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Recursion beats using span for removing the initial ('s.

Haskell, 33 bytes

f s=do ')'<-snd$span(<'@')s;"@) "

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JavaScript, 42 41 bytes

s=>s.split(/(?<=@.*)\)/).fill``.join`@) `

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Canvas, 10 9 bytes

@ｓｊ∑Ｌ@) ×

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