Peel the pineapple and cut out the stalk. Dice the flesh and puree it with the cutting stick of the hand mixer. Let it freeze a little in the freezer. Cut baby pineapples into eighths and put a slit in each case on a bulbous glass.
Add a good 1 tablespoon of pineapple puree and pour 2 tablespoons of aperol over each. Top up with well chilled sparkling wine. Decorate with lemon balm.