Combine the raspberries, sugar and salt in a blender, or food processor with the chopping blade. Turn on pulse or puree for about 1 to 2 minutes. You want the sugar to dissolve and the raspberries to become as smooth as possible. Now pour the raspberry mixture through a fine sieve, and discard any seeds caught in it. It helps to use the back of a spoon to press the berries into the sieve. It will make the process faster.

In a stand mixer (or large bowl and hand mixer) whip the heavy cream and the confectioners' sugar. Start slow until it thickens slightly, then amp the speed up to high. Whisk on high until stiff peaks form, which will take about 3 to 4 minutes.

Take decorative glasses and alternate adding the whipping cream mixture and the raspberry mixture. Once you fill the glasses take a knife or wooden skewer and swirl and pull so the mixture starts to show patterns. I found pushing the skewer down in a rapid movement worked really well for the fun lines down the sides.

Top with extra whipping cream and raspberries for garnish if desired.

You can serve these immediately or pop them in the fridge for about an hour. If you're going for the dramatic look serve them as close to making them as possible. The longer they sit in the fridge the more the color becomes muted and not as striking.