Blend pomegranate arils in a juicer with ¼ cup of water, pass the juice through a sieve so that the small remains of the hard seeds get removed and keep aside.
Now add yogurt, vanilla extract and honey in a mixing bowl, whisk it very well and make a smooth creamy texture.
Take a small bowl. Add ¼ cup hot water, add chopped agar-agar strands and mix it well till dissolve very well, keep aside.
Now add pomegranate juice into the yogurt mixture, add agar-agar mixture, whisk it again and mix well.
Now pour the mixture into small glasses or cup or small jar and keep inside a refrigerator for 2-3 hours till set.
Pomegranate mousse is ready, garnish it with some pomegranate arils, chopped pistachios, mint leaves and serve chilled.