fish and chips is my favourite dish why helping verb used is "is" when we are talking of - English - Verbs

Question

fish and chips is my favourite dish

why helping verb used is "is" when we are talking of two different
things?

Sourav Khan · Accepted Answer

Here 'fish&chips' is considered to be a single dish so

fish and chips is my favourite dish. why helping verb used is "is" when we are talking of two different things?