cook up

Short definition from Wiktionary

Verb

1. 1
   To prepare (food or chemical substances) by cooking or heating.
2. 2
   To manufacture; to invent (something, often a deceit or falsehood); to counterfeit (something).
3. 3
   To prepare (heroin, opium, crack, or meth) by heating or otherwise manufacturing.
4. 4
   To manufacture a significant amount of illegal drugs (LSD, methamphetamine, etc.).
5. 5
   Used other than figuratively or idiomatically: see cook, up.

Noun

1. 1
   A get-together for the purposes of cooking, especially one that produces large quantities of food.