Here is another ancient prayer that you can use at mealtime.
Εύλογητός εί, κύριε ό τρέφων με έκ νεότητός μου,
A Prayer at Dinner (Apostolic Constitutions: Book VIII : LXIX)
ό διδούς τροφήν πάση σαρκί·
πλήρωσον χαράς καί εύφροσύνης τάς καρδίας ήμων,
ίνα πάντοτε πάσαν αυτάρκειαν έχοντες
περισσεύωμεν είς πάν έργον άγαθόν έν Χριστώ Ίησου τω κυρίω ήμων,
δι’ ού σοι δόξα, τιμή καί κράτος είς τούς αίώνας· άμήν.
Click here for an English translation
Thou art blessed, O Lord, who nourishest me from my youth, who givest food to all flesh. Fill our hearts with joy and gladness, that having always what is sufficient for us, we may abound to every good work, in Christ Jesus our Lord, through whom glory, honour, and power be to Thee for ever. Amen.
Translated by James Donaldson. From The Ante-Nicene Fathers, Vol. 7. Edited by Alexander Roberts, James Donaldson, and A. Cleveland Coxe. (Buffalo, NY: The Christian Literature Company, 1896.)