Before Eating
In the name of Allah Subhan-Wa-Taala and upon the blessings of Allah Subhan-Wa-Taala. (Al-Hisnul Haseen Pg. 141)
Virtue
One who reads this dua will receive blessing in one’s meals.
When forgetting to recite the dua before eating
In the name of Allah Subhan-Wa-Taala in the beginning and the end. (Abu Dawood, Vol. 2, Pg. 173)
After Eating
All praise be to Allah Subhan-Wa-Taala who gave us food and drink and made us Muslims. (Al-Hisnul Haseen Pg. 144)
Virtue
Allah Subhan-Wa-Taala becomes pleased when His slave praises Him after meals.