Foods (Kitab Al-At'imah)
Dawud :: Book 27 : Hadith 3758
Narrated Aisha, Ummul Mu'minin:
The Apostle of Allah (peace_be_upon_him) said: When one of you eats, he should mention Allah's name; if he forgets to mention Allah's name at the beginning, he should say: "In the name of Allah at the beginning and at the end of it."