Place all ingredients, except for the breadcrumbs, in a large bowl and mash until thoroughly combined.Form the mixture into 8 equal patties and roll them in the panko breadcrumbs. (You can make smaller patties if you prefer.) Refrigerate the patties for at least 30 minutes or until they've firmed up.
Heat some oil in a non-stick pan and fry the patties on each side for 3-4 minutes until lightly browned, being careful not to overcrowd the pan.
Serve immediately with our BEST homemade tartar sauce!
Notes
To save time, cook the fish and potatoes in advance then mash the ingredients together when you're ready to make the fish cakes.