Yes, here is a letter from His Divine Grace on the subject written to Surasrestha dasa Brahmacary on June 14, 1972:
In answer to your questions, the red incarnation who appeared in the Treta-yuga is Yajnapati. Lord Mohammed is accepted by us as Saktyavesa Avatar, but we do not recognize the Bahai faith. Lord Caitanya Mahaprabhu appears once in the day of Brahma or whenever He is required to come. So far attending pujas at the houses of the Hindus there we can go and hold our kirtana but we should not take prasadam there. We can accept raw materials and take them to our temple but we should not accept any prasadam prepared by them. However, if they insist then we can take fruits and milk and offer them to Krishna. Cocoa and chocolate are not to be taken as they are intoxicants.
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July 14, 2015 at 7:41 pm
What about devotees eating chocolate? Did Srila Prabhupada ever comment on this?
July 14, 2015...Robert LessengerRobertLessengerdgservant@rvc.eduAdministratorDanavir Goswami