Wash the leaves. Blanch them. Place the leaves in boiling water for 30 seconds. Remove the leaves and transfer the leaves to a container with ice water; Chilling would keep the leaves green. Drain.
The blanched leaves are about 2 cups.

Blend them with two cups of water for a couple of minutes.
Strain the blended leaves in water through a wire mesh basket. Add agave nectar to the strained liquid. Whisk to dissolve the nectar.

Dissolve agar in a bowl in 1tbsp juice
Keep a sauce pan over over medium heat, add the green juice, add the dissolved agar mix, stir, bring it to boil, reduce the heat low stir 1-2 min. Cool to room temperature. Pour into any mold you feel like using-bowl, or a glass. I used a heart shaped mould and a wine glass. Refrigerate for a couple of hours to form the jelly. I did it overnight. You can top the ice cream with the jelly and enjoy