Add the frozen strawberries to a high-speed blender.

Pour in the prepared lemonade and fresh lemon juice.

Add the ice cubes to help create a thick slushy texture.

Blend the mixture on high speed until smooth and evenly combined.

Pause the blender and taste the mixture to check the sweetness level.

Add sugar or simple syrup if you prefer a sweeter drink.

Blend again for a few seconds until the sweetener is fully incorporated.

If the mixture is too thick, add a small splash of lemonade and blend briefly.

If the mixture is too thin, add a few more frozen strawberries or ice cubes.

Pour the frozen strawberry lemonade into chilled glasses.

Garnish with fresh strawberries, lemon slices, or mint leaves if desired.

Serve immediately while the drink is icy and refreshing.