Using a rubber spatula, press avocados through a sieve into a large bowl. Add sherry and 1/2 cup sugar. Stir to combine.
In a large, chilled bowl, whip heavy cream with remaining 1/2 cup sugar until soft peaks form. Fold whipped cream into avocado mixture. Divide between meringue shells. Top with one or more garnishes, if desired.
SourceMartha Stewart Living Television