Firstly, Wash and cut the drumsticks into pieces. Set aside.
Peel and cut the potatoes into medium-sized pieces.
Now prepare tomato paste. Blend the tomatoes - 2 (med), green chilies - 2, and 1 inch ginger into a smooth paste.
Heat 2 tbsp oil in a pressure cooker over medium heat.
Add 1/2 tsp mustard seeds and allow them to crackle.
Add 1/4 tsp cumin seeds, 1/8 tsp hing, and curry leaves. Sauté briefly.
Add the tomato, ginger, and green chili paste.
Cook until the raw smell disappears, stirring occasionally.
Add turmeric powder - 1/4 tsp, red chili powder - 1 tsp, coriander powder - 1 tsp , and cumin powder - 1 tsp.
Cook the masala until the spices are roasted and the oil begins to separate.
Add kasoori methi - 1 tsp, fennel powder - 1/2 tsp, and chopped coriander - 1 tbsp. Mix well.
Add the drumsticks and potatoes and mix gently with the masala.
Cook for about 5 minutes, stirring occasionally.
Add 1½ cups water and salt to taste.
Add garam masala - 1/4 tsp and a small piece of jaggery if using.
Bring the mixture to a boil.
Close the pressure cooker and cook until one whistle.
Turn off the heat and allow the pressure to release naturally.
Open the cooker and check that the potatoes and drumsticks are tender.
Garnish with fresh coriander and grated coconut.
Serve hot with steamed rice, roti, chapati, or paratha.