Finely chop the herring fillet, onions and peeled apple. Mix the prepared foods with mayonnaise.
Finely chop the crab sticks, fry in a frying pan in butter and mix with chopped green onions. Then quickly fry and immediately put the filling in a bowl.
Spread 2 slices of bread for toast without a crust with herring filling, 2 slices - crab. Combine the slices and top with the remaining slices of bread. Spread the resulting sandwich cake on three sides with cream cheese.
Grind the pistachios and sprinkle them on the oiled sides of the cakes. Put the appetizer in the refrigerator for 30 minutes, decorate if desired.