01 - Combine strawberries, sugar, and water in a small saucepan. Heat gently for 2-3 minutes until strawberries soften and release their juices. Let cool completely, then blend until smooth. Strain through a fine-mesh sieve if you prefer a seedless puree.
02 - In a shaker or large glass, combine the cooled strawberry puree, cold milk, and heavy cream. Stir vigorously until fully incorporated and smooth.
03 - Divide ice cubes evenly between two tall glasses. Pour the strawberry cream mixture over the ice, splitting equally between glasses.
04 - Slowly pour the cold brewed espresso over the back of a spoon to create a layered, marbled effect on top of the strawberry cream mixture.
05 - Top with whipped cream if desired and garnish with fresh strawberry slices. Serve immediately while chilled.