Heat oil in a pan over medium heat, add cumin seeds and asafoetida.
Add chopped onions and curry leaves, sauté until onions turn pink.
Add sliced karela and salt, sauté for 3 minutes.
Cover the pan and cook until karela becomes tender.
Add turmeric, red chili powder, coriander powder, and fennel powder.
Cover and cook until karela is completely soft.
Stir in lemon juice and garnish with fresh coriander leaves before serving.