01 - Combine strawberries, sugar, and lemon juice in a blender. Blend until completely smooth, scraping down sides as needed.
02 - Add milk, heavy cream, vanilla extract, and ice cubes to the blender. Blend on high speed until fully combined, frothy, and smooth.
03 - Taste the mixture and add additional sugar if desired. Blend briefly to incorporate any adjustments.
04 - Pour the frappuccino into two tall glasses. Top with whipped cream and sliced strawberries if using. Serve immediately while cold.