Place the juice, salt and agar in a saucepan and bring to a boil. Reduce the flame to medium-low and simmer about 15 to 20, stirring frequently until the agar flakes dissolve. Remove from the flame and allow to cool for 15 minutes.
While the juice is cooling, slice the strawberries and place them in a glass or ceramic cassarole dish. When the juice is is slightly cooled, pour it over the fruit. Place in the refrigerator and chill for about 1 hour or so until gelled. Remove, slice and serve.
Per serving - 66 calories, 0 g fat (3% calories from fat), 0 g protein, 17 g carbohydrate, 3 g fiber, 0 mg cholesterol, 20 mg sodium