Fill a large wine glass generously with ice cubes.
Pour in the Aperol.
Add the Prosecco and stir once or twice, very gently, to combine without losing carbonation.
Top with a splash of soda water.
Garnish with a fresh orange slice on the rim or inside the glass.
The classic Aperol Spritz ratio is 3-2-1: three parts Prosecco, two parts Aperol, one part soda - always build in that order to protect the bubbles and keep the drink lively to the last sip.
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