In a pressure cooker add tuvar dal, all the chopped vegetables, turmeric powder, salt, and water.
Open the lid and stir the mixture well using a spatula.
Add sambar masala powder and tamarind paste and mix well. Add the desired amount of water so that it doesn't become too watery. Bring it to boil. (Sambar tends to thicken very fast so you can adjust the quantity of water depending on your choice)
Pour the seasoning to the sambar. Mix well.