1 cup lime-flavored sparkling water (such as La Croix®), or as needed
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½ slice lemon
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1 sprig lemon thyme
Instructions
Heat water, sugar, and 3 sprigs lemon thyme in a small saucepan, stirring, until bubbles form and sugar is dissolved, about 5 minutes. Remove from heat and let steep, about 10 minutes. Strain out lemon thyme.
Pour 1/2 fluid ounce of the lemon thyme syrup into a tall glass. Add lemon juice and 3 raspberries; mash with a muddler or wooden spoon. Fill glass with ice and vodka; stir vigorously with a long spoon until well chilled. Fill glass with sparkling water.
Garnish with remaining raspberries, lemon slice, and 1 lemon thyme sprig.