Wash one lime and cut one wedge and one thin round slice.
Fill a highball glass with fresh ice.
Pour 40ml of vodka over the ice.
Top with 100ml of chilled tonic water, pouring gently down the side of the glass to preserve carbonation.
Squeeze the lime wedge over the drink and drop it in.
Garnish with the lime slice on the rim and serve immediately.
Always use chilled tonic water and pour it down the side of the glass - this preserves carbonation and keeps the drink lively to the last sip. Premium tonic waters with natural quinine make a noticeable difference in a drink this simple.
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