Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) ordered ablution (wudu) on account of eating what has been cooked by fire only in the sense of washing the hands and the mouth for cleanliness, and it is not obligatory.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17270