Prepare the prawns. Scald them for a minute in salted water and chop them all. Leave four without chopping, they will serve as decoration.
Prepare the filling. Mix the chopped prawns with the radishes, also chopped, and the cream cheese.
Assemble the canapes. Spread the filling on the canape bread.
Roll the two halves to form individual cylinders and cut them in half.
Finish the canapés by placing a prawn on top, the Grand Krust cocktail sauce, the chopped chives, and a few slices of radish.