to concoct
Il nous faut concocter un plan.
We need to come up with a plan.
Aujourd'hui, je vais te concocter tes biscuits de riz préféré, Tanjiro.
Today, I’ll make you your favorite rice crackers, Tanjiro.
— Demon Slayer : Kimetsu no Yaiba - Le film : Le train de l'Infini (2020)
Comment peuvent-ils simplement concocter un truc pareil ?
How could they possibly come up with something like that?