A Sanskrit consecration of food taken from the Gita is as follows:
BRAHMAPANAM - BRAHMA HAVIRE BRAHMAGNI - BRAHMAN A HOTA BRAHMAI - TAN - GANI BYAM
BRAHMA - KARMA - SAMADHINAH GURU BRAHMA - GURU VISHNU - GURU DAWVO MAHISH WARA
GURU SAKSHAT
PARAM BRAHMA TUS MA EE
SHRI GURU VEY NA MA HA
OM SHANTI SHANTI SHANTI
Translation: This ritual is Brahma. The food is Brahma. He who offers the food is Brahma. The fire (hunger) is also Brahma. All ??? is Brahma. He who knows this may go to Brahma. I offer this food to the Guru who is the creator, the preserver, and the agent of change. To the Guru who is also all energy and who is the Sun beyond all. I touch the lotus feet of the Guru. OM, Peace, Peace, Peace. (Just before OM, SHANTI, SHAN- TI, SHANTI … you may wish to inject silently some additional beings whom you wish to honor by offering the food.)
It is true that food offered with a pure heart is received in essence.
In a short story by J.D. Salinger called “Teddy,” a young boy who is a very high being describes how he first realized in this lifetime how it all was:
“I was about six years old and was watching my little sister in her highchair drinking milk. Suddenly I saw it was like pouring God into God if you know what I mean.”
Perhaps you would find it a meaningful mantra to merely think upon pouring God into God, if you know what I mean.