Combine sugar substitute and water in a saucepan and bring to a boil.
Add cranberries and orange zest and bring back to a boil. Reduce heat and simmer for 10 minutes, stirring occasionally.
Remove from heat, cool, cover and refrigerate until ready to serve.
George Stella's Livin' Low Carb: Family Recipes Stella-Style, Simon and Schuster, 2005