To begin making the Usal Pav Recipe (A Delicious Mumbai Street Food) by pressure cooking the peas that is soaked in the pressure cooker for 5 whistle and release the pressure naturally and keep it aside. 

Next heat 2 tablespoons oil in a heavy bottomed pan. Once the oil is hot, add in the mustard seeds. Once it crackles, add in the curry leaves and hing.

Then add garlic & sauté for a minute or so. Before it turns dark brown, add in the chopped onions and saute till translucent.

Now add the chopped tomatoes and saute it for a few minutes until it softens. Once softened and the tamarind water and allow it all simmer on low heat for about 2 to 3 minutes. 

Finally, pour the cooked peas into the wok, along with garam masala, chilli powder and salt. Turn the heat to low, cover the pan and let the mixture simmer for about 10 minutes. Turn off the heat, check the salt and seasonings and adjust to suit your taste.Stir in the chopped coriander leaves and transfer to as serving bowl. Serve the tangy hot usal pav accompanied with toasted pav, toasted bread. You can also top the Usal with finely chopped onions, sev and green chillies and serve it as a Snack Meal for Kids.