An Etymological Dictionary of the German Language/Annotated/kochen

by Friedrich Kluge

kochen, ‘to cook,’ from the equivalent Middle High German kochen, Old High German chohhôn, from Latin coquere (more accurately *coquâre?). The High German word could not remain a strong verb, because the vowel of the stem differed from the analogy of verbs of that class. In Romance note French cuire, Italian cuocere. Compare also Kuchen.