Real Strawberry Frosting

I am making my French macarons pink and filling them with this recipe for strawberry frosting with real strawberries that I found on AllRecipes.  It sounds perfect.

Ingredients
1 cup fresh strawberries (I'm using thawed frozen strawberries.)
1 cup butter
1 cup confectioners' sugar, sifted
1 tsp vanilla extract
2 1/2 cups confectioners' sugar, sifted, divided

Directions

1. Place strawberries in a blender; puree until smooth. 
2. Transfer strawberry puree to a saucepan over medium heat; bring to a boil, stirring often, until puree is reduced by at least half, about 20 minutes. Remove from heat, pour through a sieve to remove seeds and any solid pieces, and let cool completely.
3. Beat butter with an electric mixer in a bowl until light and fluffy.
4. Beat 1 cup confectioners' sugar into butter until just blended.
5. Beat 2 tablespoons strawberry puree and vanilla extract into butter mixture until just blended.
6. Repeat with 1 cup confectioners' sugar, followed by 2 tablespoons strawberry puree two more times.
7. Beat last 1/2 cup confectioners' sugar into mixture until just blended.