01 - Place strawberries, sugar, and lemon juice in a blender. Puree until completely smooth.
02 - Pour in milk, heavy cream, and vanilla extract. Add ice cubes. Blend on high speed until mixture is fully incorporated and frothy.
03 - Taste the blended mixture. Add additional sugar if needed to achieve desired sweetness level.
04 - Distribute frappuccino evenly between two tall glasses. Top with whipped cream and fresh strawberry slices if using. Serve immediately while cold.