God is supreme, the creator and sustainer of all life. Whatever seeds we sow, cultivate and finally harvest are because of his blessings and grace.
So out of gratitude and devotion to god we offer a vegetarian meal to him twice daily, once in the morning and then another in the evening. After the food is graced by him is becomes Prasad. The Prasad when eaten with gratitude purifiers the mind and the senses.