In a large heat-proof container, dissolve sugar in boiling water. Cool.
Add fresh squeezed lemon juice and peel; mix well.
Cover and store in the refrigerator for up to 1 week.To Prepare
For 1 serving, combine 1/4 to 1/3 cup lemonade syrup and 3/4 cup cold water in a glass; stir well. For 8 servings, combine 2-2/3 cups syrup and 5 cups cold water in a 2-qt. Pitcher; stir well.