01 - Combine strawberries, sugar, and water in a small saucepan or microwave-safe bowl. 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 a seedless puree is preferred.
02 - In a cocktail shaker or large mixing glass, combine the cooled strawberry puree, cold whole milk, and heavy cream. Stir vigorously until thoroughly incorporated and smooth.
03 - Divide ice cubes evenly between two tall glasses. Pour the strawberry cream mixture over the ice, distributing equally between glasses.
04 - Slowly pour the cold brewed espresso or coffee over the back of a spoon held just above the cream mixture to create a beautiful marbled layering effect.
05 - Top each glass with a generous dollop of whipped cream and garnish with fresh strawberry slices. Serve immediately while chilled.