Step 1

Combine sugar and water (or orange juice) in a 1 cup (or larger) microwave-safe cup or bowl. Stir to combine. The mixture will be very thick.

Step 2

Cook in the microwave on high power for two minutes. Stir for 5-10 seconds to ensure that the sugar crystals are dissolved.

Step 3

Combine frozen raspberries and hot syrup in a blender container. Blend until the mixture is smooth and pureed.

Step 4

Pour puree through a fine-mesh strainer set over a medium-size bowl. Stir and push on the solids with the back of a rubber spatula until all of the liquid has been extracted. This will take several minutes as the mixture will be thick.

Step 5

Discard the seeds. Add the liqueur, if using and stir to combine.

Step 6

Store in the refrigerator for 5-7 days or in the freezer for 2-3 months.