After cooking for krishna, the food will be offered with the following mantras:

Prayer to Srila Prabhupada:

nama om vishnu-padaya krishna-preshthaya bhu-tale
shrimate bhaktivedanta-svamin iti namine

namas te sarasvate deve gaura-vani-pracarine
nirvishesha-shunyavadi-pashcatya-desha-tarine

"I offer my respectful obeisances unto His Divine Grace A. C. Bhaktivedanta Swami Prabhupada, who is very dear to Lord Krishna, having taken shelter at His lotus feet. 

Our respectful obeisances are unto you, O spiritual master, servant of Bhaktisiddhanta Saraswati Goswami. You are kindly preaching the message of Lord Chaitanyadeva and delivering the Western countries, which are filled with impersonalism and voidism."

Prayer to Lord Chaitanya:

namo maha-vadanyaya krishna-prema-pradaya te
krishnaya krishna-chaitanya-namne gaura-tvishe namah

"O most munificent incarnation! You are Krishna Himself appearing as Sri Krishna Chaitanya Mahaprabhu. You have assumed the golden color of Srimati Radharani, and You are widely distributing pure love of Krishna. We offer our respectful obeisances unto You."

Prayer to Lord Krishna:

namo brahmanya-devaya go-brahmana-hitaya ca
jagad-dhitaya krishnaya govindaya namo namah

"I offer my respectful obeisances unto Lord Krishna, who is the worshipable Deity for all brahmanas, the well-wisher of the cows and the brahmanas, and the benefactor of the whole world. I offer my repeated obeisances to the Personality of Godhead, known as Krishna and Govinda."

Hare Krishna Hare Krishna - Krishna Krishna Hare Hare
Hare Rama Hare Rama - Rama Rama Hare Hare