Heat oil in a pan and saute the onion and curry leaves for a little while.
Add the tomatoes, ginger garlic paste, green chillies, chillie powder, turmeric, garam masala / spice powder, cumin powder, coriander powder and salt and stir fry till the oil separates from the mixture.
Add the drumsticks and hard boiled eggs and 2 cups of water and simmer on low heat till the drum sticks are cooked and the gravy thickens.
Garnish with chopped coriander leaves.
Serve this delicious curry with rice or chapattis.