Glory to Jesus Christ!
When I eat between main meals I forgo the prayers of introduction and do this:
(Make sign of the Cross)+Through the Prayers of Our Holy and God Bearing Fathers, O Lord Jesus Christ Have Mercy on us and save us!. Amin!
+Christ God bless the food and drink of your servants for you are holy, now and ever and unto Ages of Ages. Amin! +(End with sign of the Cross)
This is a part of my prayer rule and is what I do in these cases. Of course at home during main meals you would face the Icon Corner standing, which is at the Eastern wall in the dining room or kitchen of your house, (whatever room you eat meals in) and begin the prayer for meals which is contained in most Orthodox books of prayer. Also one should bring holy water with them to sprinkle on their food to drive away all maledictions and curses. This should be done at main meals as well. My God mother would also burn incense at meals, and bless the meal with holy water and incense. Of course if you have a priest or monk they have priority for asking the blessing. In the home without clergy or monastics, the head of the house has first priority in asking the blessing, then the wife, grandfather, grandmother, children, etc. The father as home-priest, not a priest of the Oblation, but by baptism and chrismation, and head of the domestic church, always has authority in the home and must preside first over all occasions delegating responsibility for prayers as needed ordering his house according to godliness.
In Christ God,