Make the filling first. Heat oil and fry onion gently until golden brown. Add the kurma powder, curry powder, chili, turmeric and fry gently. Add the chicken, potatoes, sugar, pepper, salt and cook for 5 minutes. Mix well and leave aside to cool.
To make pastry, mix flour with margarine, water, salt, and knead well. Let it rest for 1/2 hour. Cut the dough into circles (3 in) in diameter. Fold pastry over to make a half circle and crimp at edges. Deep fry in hot oil until golden.