Wash the snake gourd, remove the inside and cut into 2 inch pieces. Marinate the mince with a teaspoon of chilly powder, tumeric powder, a little salt and some chopped coriander leaves. In a pan heat the oil and fry the chopped onions till golden brown. Add the ginger garlic paste and sauté for some time. Add the chilly powder, coriander powder, spice powder, green chilies, coconut and salt and fry for a few minutes .Add the tomato puree and fry till the oil separates from the masala. Now add 2 cups of water and bring to boil. Meanwhile stuff the snake gourd rings with the marinated mince. Pack each ring tightly so that the mince does not fall out. Slowly drop the stuffed snake gourd pieces into the boiling curry and cook on low heat till the gravy is sufficiently thick and the mince is cooked. Garnish with chopped coriander leaves. Serve hot with coconut rice or plain rice.