Make the thyme syrup: Add sugar, water, and thyme to a small saucepan. Bring to a gentle simmer, stir until sugar dissolves, then turn off heat. Let it steep 10 minutes, strain, and cool.

Muddle the berries: In a cocktail shaker, add blackberries. Gently muddle until juicy but not pulverized to seeds.

Add the base: Pour in vodka, lemon juice, and thyme syrup. Fill the shaker with ice.

Shake hard: Shake 10–12 seconds until the shaker is frosty. This chills and slightly dilutes for a smoother sip.

Strain: Double strain into a chilled coupe for a smooth finish, or strain over fresh ice in a rocks glass for a more relaxed serve.

Optional fizz: Add a small splash of soda water or dry tonic if you want it lighter and spritzy.

Garnish: Add a thyme sprig, a few blackberries, and a lemon wheel. Serve right away.