Upon completing the meal

الْحَمْـدُ للهِ الَّذي أَطْعَمَنـي هـذا وَرَزَقَنـيهِ مِنْ غَـيْرِ حَوْلٍ مِنِّي وَلا قُوَّة

Praise is to Allah Who has given me this food, and sustained me with it though I was unable to do it and powerless.

At-Tirmidhi, Abu Dawud, and Ibn Majah. See also Al-Albani, Sahih At-Tirmidhi 3/159.