con·coct 
(kən-kŏkt)
(kən-kŏkt)tr.v. con·coct·ed, con·coct·ing, con·cocts
1. To prepare by mixing ingredients, as in cooking.
2. To devise, using skill and intelligence; contrive: concoct a plan.
[Latin concoquere, concoct-, to boil together : com-, com- + coquere, to cook; see pekw- in the Appendix of Indo-European roots.]
con·cocter, con·coctor n.
con·coction n.
con·coctive adj.