For the jelly: peel and cut the beetroot and cook with the juice and spices for 1.5 hours. Drain. Mix 500 ml of beetroot stock with the Agar-Agar and cook for approx. 2-3 minutes. Stir in the dissolved gelatine. Pour the mixture into a square dish and allow to set. Tip the jelly out of the dish and cut into cubes.