In a medium saucepan, bring cranberries, sugar, 3 tablespoons (45 grams) water, and orange zest to a boil over medium-high heat. Reduce heat to medium, and cook until thickened, about 6 minutes. Using the edge of a spatula, mash cranberries. Remove from heat, and let cool completely. Refrigerate in an airtight container for up to 1 week.