Sprinkle the gelatin over 1 cup milk in a small bowl, wait 1 minute.
Add vanilla extract. Add sugar. Bring to a boil over low to medium heat, stirring until sugar has dissolved. Remove from heat. Add gelatin mixture to hot milk mixture. Stir until dissolved. Quick-chill in an ice bath, stirring occasionally, until cold but not thickened, about 5-10 minutes.
Stir in buttermilk. Pour into bowls and chill until set, at least 6 hours.
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