Before starting, ensure to use freezer-safe glasses.

Add a small handful of frozen cranberries to the bottom of each glass.

Take a sprig of rosemary, cut the bottom so it's even, and place it into the middle of the glass. Spread out the bottom leaves to keep it in place.

Add water to the glasses, ensuring the rosemary stays upright.

Place the glasses on a small baking sheet and freeze for 45 minutes or until the water is frozen.

Serve immediately with your favorite alcohol or sparkling water.