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Wiktionary
cook up

vb. 1 (context idiomatic figuratively English) To manufacture; to fabricate; to falsify; to devise an elaborate lie. 2 (context slang English) To prepare a heroin dose by heating. 3 (context slang English) To prepare a meal. 4 (context slang English) To manufacture a significant amount of illegal drugs (LSD, meth, etc.)

WordNet
cook up
  1. v. prepare or cook by mixing ingredients; "concoct a strange mixture" [syn: concoct]

  2. make up something artificial or untrue [syn: fabricate, manufacture, make up, invent]

Usage examples of "cook up".

I keep a few of the undomesticated variety around in case I want to cook up special dishes for people who don’.