Josh,
It seems we both had the same idea. I just finished eating a Madras made with this base and using some of the technique mentioned by Spice-N-Nice.
For the base I used:
1.6kg Onions (peeled weight)
20ml Deggi Mirch
20ml Salt
5ml Tomato Puree
20ml Oil
I boiled the onions in enough water to cover them for 2 hours. Took the base off the heat, added the other ingredients and blended it until smooth.
For the Madras I used:
2tbsp Oil
5ml Tomato Puree mixed with 5ml water
2tsp Cumin
2tsp Coriander
1tsp Extra Hot Chilli Powder
240ml Base (4 chefs spoons)
50ml Water
I heated the oil and then fried the Tomato Puree for about 30 secs. I took the pan off the heat and added the Chili Powder and fried for another 30secs. I put the pan back on the heat and added the base and added the other spices and the water and boiled it rapidly. After about 10 mins it was ready.
Tasted nice I would certainly be satisfied buying this from an average BIR, it was a basic no frills Madras. I was quite surprised at how well such a basic base can perform, the base itself tasted like Vegetable and Tomato Soup with Chili in it, no suprises there

I'd make it again because I like the variety a basic base can give.
Heres the pictures:
Base after boiling and adding other ingredients

Base after blending

The Madras

Served
