Firstly wash and soak moong dal with enough water for 30 minutes and keep aside
Add dal, water, garlic, small onions, turmeric powder, and sesame oil to a pressure cooker
Close the lid and cook for 3-4 whistles. Simmer for 10 seconds and turn off the stove; do natural pressure release
Mash the dal well
Add water, sambar powder, tamarind paste, salt, coriander leaves, curry leaves, and asafoetida and mix well
Cook for 5-6 minutes until the sambar boils well; turn off the stove
Add ghee to a small pan and heat
When ghee turns hot add mustard seeds, fenugreek seeds, and cumin seeds and lets them splutter
Transfer it to the tiffin sambar and bring to boil; turn off the stove