Toast the coriander seeds and cumin seeds in a saucepan.
Rinse the red split lentils, then cook them with garlic, lemongrass, turmeric, chilli powder, coriander seeds, cumin seeds, and coconut milk.
Add greens and cook until creamy.
Prepare the temper with coconut oil, red onion, garlic, mustard seeds, and curry leaves.
Finish the dal by topping with the temper and a squeeze of lemon juice, then serve with chapatis or rotis.