To begin making the Banarasi Tamatar Chaat Recipe, keep all the ingredients ready. 

In a kadai, heat oil on medium flame, add the onion, green chilli and ginger and saute for 3 to 4 minutes until the onions turn transparent.

Once the onions are nice and soft, add the chopped tomatoes and give it a mix.

Cover and continue to cook for about 5 minutes, until the tomatoes have softened and are completely mushy.

Now that the onion-tomato mix has come together, add the mashed potatoes and mix it well until the mixture comes together.

Season the onion-tomato-potato mixture with the dry masala - pav bhaji masala, garam masala, cumin powder, red chilli powder, chaat masala, black salt and salt.

Give the Banarasi Tamatar Chaat a good stir, let it cook for another 2 minutes and turn off the heat.

Add freshly squeezed lemon juice and garnish the Banarasi Tamatar Chaat with namak para, sev and coriander leaves. 

Serve this Banarasi Tamatar Chaat Recipe along with Dahi Bhalla Papdi (Puri) Chaat Recipe and Chole Aloo Tikki Chaat Recipe (An Indian Street Food Snack) at your chaat party.