Fish dish using perch regularly cooked with chives mainly (7)

'fish dish' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'perch regularly cooked with chives mainly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'cooked with' is an anagram indicator (letters cooked into a new form).
'mainly' means to remove the last letter.
The alternate letters of 'perch' are 'ec'.
'chives' with its last letter taken off is 'chive'.
'ec' anagrammed with 'chive' can make 'CEVICHE'.

'using' is the link.

Can you help me to learn more?