The Bhojan mantra is mentioned in Bhagwat Gita in Chapter 4 of Sloka 24. This mantra talks about salutation to Brahman, who created everything and provided everything we have as food.
AUM, Lord of foods, Feed our bodies and make our crops strong.
Heavenly Benefactor. grant all beings our sustenance.
AUM. Peace Peace Peace
Food is considered to be "Annam Parabrahma SwaroopamтАЭ (Food is God's personification).
Worship Goddess Annapurna, the giver of food, Devi Annapurna is an avatar of Devi Parvati, who helped devas and humans with food during scarcity.