Uncountable nouns

If honey is mixed with milk to make a sweet drink, then that drink, honey and milk, IS your favorite drink. If you mean you like to drink milk (by itself) and honey (by itself, bleechh), then honey and milk are your favoriteS or favorite drinks.

I agree. It all depends on the context. If mixed, then use the singular verb to describe how you feel about the singular drink. If separate, use the plural verb to describe how you feel about the different entities.

the first one is incorrect altogether
i agree with the 2 comments, but in order for the first one to be correct, it would have to say "honey and milk are my favorites" since it would have to refer to honey and milk as 2 seperates drinks to be valid

Thanks Pinto, I missed the S in favoriteS.

go the "are"
it sounds right

Your friend is wrong.

I mostly agree with these comments, but I should caution that the distinction between favorite as an adjective and favorite as a noun should be clarified. I believe you can say "of all of the wines in Napa, these are my favorite." Likewise, you could have:

a: Which additives do you prefer for your tea?
b: Honey and milk are my favorite.

It all depends on context. But mostly would would want the noun form, which would be pluralized: "honey and milk are my favorites".

Answer: Honey and milk are my favourites.