The day before: Pour the bottle of rosé into a shallow freezer-safe container or an ice cube tray. Freeze for at least 6 hours, or overnight. (It won't freeze solid because of the alcohol — you're looking for a slushy texture.)
Scoop the frozen rosé into a high-powered blender.
Add the frozen strawberries, vodka, simple syrup, and lemon juice.
Blend until smooth and slushy. If it's too thick, add a splash more rosé or a few ice cubes; if too thin, add more frozen strawberries.
Taste and adjust — add more simple syrup if you'd like it sweeter, more lemon for brightness.
Pour into chilled coupes or wine glasses. Garnish with a fresh strawberry and a sprig of mint.