Step 1: Make the Strawberry Puree

1. In a small saucepan, heat 1 cup of fresh strawberries (chopped) over medium heat.
2. Cook for about 5-7 minutes, stirring occasionally, until the strawberries break down and release their juices.
3. Blend the mixture until smooth, then strain through a fine-mesh sieve to remove seeds.
4. Return the strained puree to the pan and simmer for 3-5 more minutes until thickened.
5. Let cool completely before adding to the buttercream.

Step 2: Make the Buttercream

1. In a large bowl, beat butter on medium-high speed for 2-3 minutes, until creamy and fluffy.
2. Gradually add powdered sugar, one cup at a time, mixing on low speed until incorporated.
3. Add the cooled strawberry puree, vanilla extract, and salt. Mix until smooth.
4. If needed, add heavy cream or milk (1 teaspoon at a time) to achieve a spreadable consistency.
5. For a more vibrant pink color, mix in a few drops of pink food coloring.
6. Beat for another 1-2 minutes until the buttercream is silky smooth.