Fill a highball glass with ice.
Add 40ml vodka and 15ml fresh lime juice.
Top with 100ml soda water.
Stir briefly to combine.
Garnish with a lime wedge.
The quality of vodka matters more than it might seem in a drink this minimal - a clean, well-distilled Finnish vodka such as Koskenkorva or Finlandia will let the lime's brightness take centre stage without any harsh alcohol edges.
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