Rehash

wiktionary

ref

re- +‎  hash

etymonline

ref

rehash (v.)

"work up (as old material) in a new form," 1822, from re- "again" + hash (v.). Related: Rehashed; rehashing.

rehash (n.)

"old material worked up anew, something concocted from material formerly used," usually of literary productions, 1849, from rehash (v.).