While the bars are baking, prepare strawberries.
Put strawberries, coconut sugar and water in a pot. and bring to a boil. Cook until strawberries are soft, then place in a blender, add agar agar and blend. Pour back into the pot and simmer for 2 minutes.
Pour over the baked bars and, if desired, add strawberry slices and let it harden.
Cut into 12 pieces and serve.