Peel the tangerines and remove any white strings. (If you have larger tangerines, that's fine, but smaller ones look nicer.) Bring the water to a boil, then add the coconut milk and stir well. Mix the sugar, powdered gelatin, and agar powder together, then gradually add this mixture to the coconut milk, stirring constantly until everything is completely dissolved.

Prepare 2 clean empty water bottles by cutting off the tops so the tangerines can fit inside. Place the peeled tangerines into the bottles, then slowly pour the coconut gelatin mixture over them. Refrigerate for 1 hour until set. Remove the bottles, peel off the plastic, and slice the fruit gelatin into rounds.

Serve this fruit gelatin cold as a delicious and unique dessert after meals.