1. Combine all ingredients in a saucepan, bring to a boil over medium heat, stirring often, reduce the heat to low, partially crush with a potato masher if desired, and simmer, covered, 5 minutes, or until the agar is dissolved.
2. Test for thickness by placing a spoonful in the freezer 2 minutes. If too thick, add some fruit juice and test again. If too thin, add more agar and test again.
3. After adjusting the thickness, refrigerate until gelled.