Bhaji (Spicy Indian Vegetable Mash)

Ingredients (Serves 2-3)  
4 tbsp canola/vegetable oil
3/4 cup chopped onions
1 fat garlic, grated
2 Thai green chillies, finely chopped [adjust to tolerance]
1 cup chopped tomatoes
3.5 cups mixed vegetables, chopped* ( I used cauliflower, bell peppers,cabbage, peas, green beans)
1/2 tsp red chilli powder (adjust to tolerance)
1/4 tsp turmeric powder
1/8 tsp roasted cumin powder
1 medium potatoes, boiled, peeled and roughly mashed while still hot
2.5 - 4  tsp Pav Bhaji Masala (the blend is quite spicy & aromatic,adjust to taste,
easily available at Indian stores)
1/2 tsp chaat masala
Salt to taste
3-4 tbsp butter (do not skip)
chopped cilantro/chopped red onion /lime wedges/green chillies to garnish

Note:
You can use chopped carrots, squashes or any vegetables of choice to the bhaji.
Add paneer cubes to the bhaji at the end of cooking. 

Method :- 

Heat the oil on high in a heavy bottomed pan/kadhai.
When the oil has heated, add the chopped onions and cook till the onions are transculent, about 5-7 minutes.
Next, add the garlic and saute for 30 seconds till you smell the aroma.
Next, add the chopped vegetables & tomatoes to the cast iron pan with a pinch of salt 
Sauté on medium for 3-4 minutes.
Let cook on medium low heat for 10-15 minutes (this time will depend on how rough your vegetables are chopped) or till the vegetables start to soften.
Add the red chilli, coriander,turmeric and pav bhaji masala. Mix well, cover the pan and cook for another 5 minutes.  
Next add the potatoes, chaat masala, salt to taste and mix well. Cover again and let cook for about 10 minutes til the vegetables are done.
Using a masher, mash everything depending on how chunky you like them. Add the butter and mix. 
Now, depending how how thick/thin you want your mash, you can add more water. 
Simmer for another 5 minutes till you see small, oily  bubbles on the surface & smell an extremely delicious aroma.
At this point, put the heat off and let sit for at least 1-2 hours.
Before serving, add a dollop of butter, chopped red onions, lemon wedges and cilantro to the bhaji and serve warm with pavs (recipe in another link)