In a medium saucepan, bring blueberries, water, cornstarch, sugar and lemon peel to a boil over medium heat and simmer 5 minutes, stirring constantly. Remove from heat and stir in lemon peel and/or juice, if desired. Store covered in refrigerator. This sauce may be served hot or cold and is delicious served over ice cream or pancakes, waffles, cheesecake or pound cake for an elegant, quick dessert. Fat: 0.2 gram Cholesterol: 0