Is my favorite food is followed by a countable noun, plural or singular? For example, should I add s to my favorite food is apple (s) So if the verb be is are, do you want to add it

Is my favorite food is followed by a countable noun, plural or singular? For example, should I add s to my favorite food is apple (s) So if the verb be is are, do you want to add it

My favorite food is + noun
No matter what noun it is, it is singular in this sentence, without s