Combine all the ingredients up to, and not including, the bread. Chill for at least a couple of hours. Spread 6 slices of bread with the fish mixture; cover with remaining slices of bread.
Mix the eggs and milk. Dip both sides of the sandwiches in this mixture. Fry in fat (I use a mix of olive oil and butter) in a heavy frying pan at moderate heat until sandwich is heated through and both sides of the sandwich are golden brown.
Eat with a sigh of bliss.
By Free2B from North Royalton, OH