01 - Place strawberries, granulated sugar, and lemon juice in blender. Blend on medium-high speed until completely smooth and no fruit chunks remain.
02 - Pour milk, heavy cream, and vanilla extract into blender with strawberry base. Add ice cubes and blend on high speed for 1-2 minutes until mixture is frothy, thick, and fully incorporated.
03 - Taste frappuccino and add additional sugar if needed. Blend briefly to incorporate any adjustments.
04 - Divide frappuccino evenly between two tall glasses. Top with whipped cream and fresh sliced strawberries if using. Serve immediately while cold.