I say a pavlova!
If it's corked it must have liquor in it. Limoncello?
Something frothy:Sloe Gin Fizz 1 oz. sloe gin1 oz. gin3/4 oz. fresh lemon juice1 oz. simple syrup4 oz. club sodaAdd sloe gin, gin, lemon juice and simple syrup to a cocktail shaker with ice. Shake well and strain into a chilled highball glass with ice. Top with soda water and garnish with an orange wedge.