Peel, wash and quarter the Jerusalem artichokes. Mix 300 ml cold water with lemon juice, put Jerusalem Artichoke in until ready to use. Clean, wash and cut spring onions into rings. Wash sage, shake dry, pluck off leaves. Cut the leaves into strips.
Heat ghee in a pot. Rinse amaranth briefly with hot water, brown with curry powder, tomato paste and tandoori masala for 1-2 minutes, add Jerusalem artichoke, spring onions and sage leaves, deglaze with 750 ml hot water and simmer covered for about 20 minutes. Season to taste with salt
Wash the chives, shake dry and cut into fine rings. Arrange Biryani in deep plates or bowls, sprinkle with chives