I was given this recipe at least 30 years ago and have yet to find anyone that doesn't love it. (Providing they like seafood) I always use haddock as I'm from Maine. Fresh is expensive right now but as far as I'm concerned there's no better tasting white fish. Can use frozen haddock or another white fish . Simple to make but soooo yummy...Don't worry about the mayo..I Promise you will not taste it.