Combine sugar and water in a medium saucepan. Bring to a boil; add cranberries, return to a boil. Reduce heat and boil gently for 10 minutes, stirring occasionally. Place a wire mesh strainer over a medium mixing bowl. Pour contents of saucepan into strainer. Mash cranberries with the back of a spoon, frequently scraping the outside of the strainer, until no pulp is left. Stir contents of bowl. Pour into serving container. Cover and cool completely at room temperature. Refrigerate until serving time. Makes 1 cup.