Bhunjante Te Agham Papam Ye Pachyante Atmakaramak
. Anyone who is cooking for himself, he is eating simply volumes of sin. So in the material world, either a man is vegetarian or non-vegetarian, they’re eating simply sin, and they will have to suffer the consequence. But so far we are concerned, we are eating remnants of foodstuff which was offered to Krishna, so we are not afraid of anything. If Krishna wants vegetable foodstuff, therefore we supply Him vegetable foodstuff, and if He wants non-vegetarian foodstuff, we can offer Him also, but He does not want it, as it is explicitly stated in the Bhagavad-gita. So we are concerned with Krishna Prasadam, neither vegetarian or non-vegetarian.
… There are many vegetarians animals also; the monkeys are vegetarians, the pigeons are vegetarians, so to become vegetarian is not very good credit. But to become Krishna Consciousness is the most important business of life.
You should try to convince your friends in that way. They should try to learn about Krishna Consciousness. But because they are vegetarians, there is great possibility for them to understand this philosophy.
This article includes both the Bhagavad-gita verse 3.13 and a letter written in 1968 to Nandarani dd which both help explaine the importance of Prasadam