Rinse the lentils well with water 2-3 times until the water runs clear.
Add the lentils to a 3-quart instant pot along with 4 cups of water, salt, and turmeric powder, and stir gently.
Close the lid of the instant pot and set the valve to the sealing position.
Press PRESSURE COOK and set the timer to 10 minutes at high pressure.
Once the timer goes off, let the pressure release naturally for 10 minutes.
Release the remaining pressure manually and open the lid.
Mash the lentils with the back of a ladle.
Note - To cook the lentils in a traditional pressure cooker, pressure cook (in a 3.5-4 liters cooker) for 1 whistle on high heat. Then reduce the heat to low and cook for 10 minutes.
Make The Sambar Masala Paste
While the lentils are cooking, make the sambar masala paste.
Heat coconut oil in a pan over medium-high heat.
Once the oil is hot, add chana dal and urad dal and fry till they turn golden brown, stirring frequently.
Add fenugreek seeds, whole coriander, seeds, dry red chilies, asafetida, onions, and curry leaves, and cook for 2-3 minutes.
Add coconut and cook for another 2-3 minutes.
Remove the pan from heat and let the masala cool to room temperature.
Once the masala is cooled, add it to a blender with ½ cup water and blend to make a smooth paste.
Make The Sambar
Add the masala paste to the cooked dal in the instant pot and mix well.
Add the vegetables and tomatoes to the pot and close the lid again.
Press PRESSURE COOK and set the timer to 3 minutes.
Once the timer goes off, let the pressure release naturally for 10 minutes.
Release the remaining pressure manually and open the lid.
Stir in the tamarind pulp.
Add more water if the sambar is thick for your liking.
Check for salt and tamarind pulp and add more if required.
Note - If cooking the sambar in a traditional pressure cooker, then pressure cook for 3 whistles on high heat.
Temper The Sambar
Heat coconut oil in a pan over medium-high heat.
Once the oil is hot, add mustard seeds, dry red chilies, and curry leaves and fry for 4-5 seconds.
Pour the tempering over the sambhar and mix well
Serve hot with rice.
Video
Notes
You can replace tuvar dal with yellow moong dal or pink masoor dal also.You can add any vegetable of your choice to the Kerala sambar recipe. I have added carrots, drumsticks, potatoes, brinjal, pumpkin, and tomatoes, but you can also add cauliflower, bottle gourd, french green beans, etc.Avoid adding asafetida (hing) to make it gluten-free.