Clean and wash prawns. Remove fiber from amaranth stalk and cut into pieces.
Heat oil in a pan, add chopped onion curry leaves, green chilli and ginger garlic paste and sauté till onions are soft.
Add prawns, salt, turmeric, red chilli, coriander, cumin and pepper powder. Mix well and sauté for 2 minutes.
Add amaranth stem and one cup of water. Cover and cook till well cooked.
Add tamarind pulp and cook for another 5 minutes.
Remove from heat and garnish with coriander leaves.
Serve hot with steamed rice.