Wash the lemon hot, dry and grate the peel. Squeeze the lemon. Mix juice and peel, sugar and rum to a marinade.
Wash the mint, shake dry and cut the leaves into strips. Peel and quarter the pineapple, remove the hard stalk and cut into small pieces. Leave to stand with the mint in the marinade for at least 30 minutes.
Whip the cream until stiff. Cut Raffaello into large pieces and fold in. Arrange pineapple salad and Raffaello cream in four glasses or small bowls.