Prepare the hibiscus tea: In a small saucepan, bring 1 cup of water to a boil. Add the dried hibiscus flowers or tea bags, reduce heat, and simmer for 5 minutes. The liquid should turn a deep ruby-red color, indicating a strong concentration.
Strain and sweeten: Remove from heat and strain the tea into a heatproof container. Add 1-2 tablespoons of honey or simple syrup while the tea is still warm, stirring until dissolved. Allow to cool completely.
Make the strawberry puree: In a blender or food processor, blend the fresh strawberries until smooth. Strain through a fine-mesh sieve if you prefer to remove seeds. Stir in the remaining 1 tablespoon of sweetener.
Combine hibiscus and strawberry: Mix the cooled hibiscus tea with the strawberry puree. Taste and adjust sweetness if needed. Refrigerate until cold (at least 30 minutes).
Prepare the espresso: Brew your espresso shots and let them cool to room temperature, or use ready-made cold brew coffee if preferred.
Assemble the drinks: Fill two tall glasses halfway with ice cubes. Pour the hibiscus-strawberry mixture to fill about 1/3 of each glass.
Add the coffee layer: Slowly pour the espresso over the back of a spoon onto the hibiscus layer to create a distinct separation between layers.
Finish with milk: Mix the vanilla extract with your milk of choice, then carefully pour it over another spoon to create the final layer. The drink should now have three beautiful, distinct layers.
Serve immediately: Garnish with a fresh strawberry slice and a dried hibiscus flower if desired. Provide a straw for stirring the layers together when ready to drink.