I saw other recipes but this is how I make my tuna cakes, very flavorful! These can also be substituted with salmon, ahi ahi, mako etc whatever fish you want but I prefer tuna or salmon ^^
Beat the egg first, them mix together all the ingredients except the butter. Mix together very well.
Take and make 6 small patties and compress them really well, make sure they are crumbly or they will fall apart. If the mix is too dry add a splash of milk at a time till its wetter. This recipe was not too dry for me.
Melt butter in a skillet on medium heat and cook the cakes till browned.