Add the chopped red amaranth leaves in to a vessel along with tamarind extract and little water. Cook it in medium flame till the leaves are soft.
Mean while add grated coconut, mustard seeds, red chillies and little water in to mixer. Grind it in to fine paste.
Add the ground masala from above step to the cooked red amaranth leaves. Add salt and little water as per the consistency required. Bring this to boil.
Heat a seasoning a pan add a tea spoon of oil, mustard seeds, urad dal, broken red chilly and curry leaves. When mustard seeds splutter and urad dal turns to brown, switch off flame and add the seasoning to red amaranth leaves sasmi.
Now red amaranth sasmi is ready to serve. It goes very well with hot rice.