Step 1

Place 12 ounces fresh or frozen raspberries (about 3 cups), 1/4 cup water, 1/4 cup granulated sugar, and 1/8 teaspoon kosher salt in medium saucepan. Bring to a simmer over medium heat. Reduce the heat to medium-low and simmer gently, stirring occasionally, until sugar is dissolved and the berries break down, about 5 minutes.

Step 2

For a smooth coulis: Transfer the mixture to a blender and purée until smooth, 20 to 30 seconds. Strain through a fine-mesh strainer, pressing and stirring the purée with a rubber spatula to extract as much as possible.

Step 3

Taste and add more granulated sugar if desired. Cover and refrigerate until chilled, at least 1 hour.