To a highball glass, add:
Fill pint glass or tumbler to the top with ice, and set aside.
In a mixing tin half-filled with ice, combine:
Cover with a mixing glass and shake until the tin is frosted, then add:
Swirl gently to combine, while preserving carbonation.
Strain into pint glass over Gelato, allowing drink to froth while pouring.
Serve with a straw.