There are O kinds of food (food here is an uncountable noun)-sushi and oranges. So we don't use is, but must use its plural form are. "Orange" is correctly used as a kind of food here. On the other hand, "sushi" and "orange" are different foods (food here is a countable noun). Therefore, it is better to use "my favorite food" than "my favorite food". (For example, see the following reference website) This sentence is best written as follows: My favorite foods are sushi and oranges.
References: Top Ten Cuisine and Oranges-nutrition.ecsd/kids%20favorite%20foods/ Rankings/Top Ten Cuisine-USA/History/Historical Index.
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Yellowbcheng: There is nothing wrong with you using' yes' in this sentence.
Because the subject' food' in the sentence is a general noun or collective noun in grammar. But there is no need to add "s" to "orange". But if the sentence is written as "sushi and oranges are my favorite foods." That's right again.
Because the verb' are' in this sentence is used to describe or respond to the two nouns before the sentence.
Two things
So grammar is just the structure of this sentence. On the contrary, the verbs in the original sentence are general nouns used to describe or apply the sentence.
Something.
So we have to use' yes'.
Reference: My knowledge of English
My favorite foods are sushi and oranges. Although sushi is countless
There are many kinds of food.
Reference: I
My favorite foods are sushi and oranges. Because there are two kinds of wild food.
So use are.
Reference: I