。
He dealt with the enemy.
Literal
He [topic-は] enemy [object-を] cooked.
料理する ('to cook') is used idiomatically for 'to dispatch, handle, deal with (an opponent).' The metaphor is of efficiently preparing/processing something — like a chef cuts up meat. Common in sports commentary, fighting contexts, and game reviews. Without the metaphor, this sentence reads comically literal ('he cooked the enemy').