In the jar of a blender, add raspberries and process until liquified.
Pour it through a fine sieve sitting over a bowl pressing down with the back of a spatula to extract as much as you can; discard the seeds.
In the bowl of a stand mixer, add cream cheese, butter, vanilla extract and ground sea salt.
Using the paddle attachment, process on medium speed until the mixture is smooth, about 2 minutes, cleaning the sides and the bottom of the bowl.
Pour in the strained raspberry juice and process until nicely blended, cleaning the sides and bottom of the bowl.
Working in batches, add the confectioners’ sugar and on low, mix until mostly blended before adding more; clean the sides and the bottom of the bowl as needed.
When sugar is all in, increase the speed to medium-high and fluff the frosting for about 30 seconds. Yields 2 ¼ cups.