In a saucepan, combine coconut milk (400 g), vanilla paste (1-2 tsp), sweetener (15 g), and agar-agar (4 g). Stir until smooth.
Next, place the saucepan over medium heat and heat the mixture until it comes to a boil.
Once it boils, continue stirring for one minute. Then carefully pour the resulting mixture into the prepared container and place it in the refrigerator for 30 minutes to set.
Berry Layer
While the coconut base is cooling, blend the blueberries (300 g) with a blender until smooth.