01 - Combine cranberries, sugar, and 1 cup water in a small saucepan. Heat over medium until cranberries burst and sugar dissolves, about 5 to 7 minutes.
02 - Remove from heat and let the mixture cool for 5 minutes.
03 - Transfer the mixture to a blender. Add orange and lemon juice. Blend until smooth.
04 - Strain through a fine mesh sieve into a large pitcher to remove skins and seeds.
05 - Add remaining 2 cups cold water and stir well.
06 - Refrigerate until cold, approximately 30 minutes (optional).
07 - Pour over ice in glasses. Top with sparkling water if desired. Garnish with mint, cranberries, or orange slices.