01 - Combine strawberries, sugar, and lemon juice in a blender. Blend until completely smooth, ensuring no fruit chunks remain.
02 - Add milk, heavy cream, vanilla extract, and ice cubes to the blender. Blend on high speed until fully combined and frothy with a slushy consistency.
03 - Taste the mixture and add more sugar if needed, blending briefly to incorporate any additions.
04 - Pour the frappuccino evenly into two tall glasses. Top with whipped cream and sliced strawberries if using. Serve immediately while cold.