Brauðterta (Icelandic bread cake)

Instructions

1. Remove the crusts from the sandwich loaf and cut it into 3 or 4 neat horizontal slices.
2. Mix the mayonnaise with the mustard, a pinch of salt and pepper to make a spreadable sauce.
3. Spread the first layer of bread with a little mayonnaise, then lay the ham over it in an even layer.
4. Add a second slice of bread, spread it, then spread the drained prawns, peas and carrots and the mashed eggs.
5. Place the third slice, spread it and top with slices of tomato and cucumber, keeping a few prawns aside for decoration.
6. Cover with the last slice, coat the top and sides with mayonnaise, and decorate with the prawns, parsley and remaining slices.
7. Wrap in cling film and chill for at least 1 hour before cutting into triangular portions.