I cooked mine for 4 1/2 hours.And i used a thick bottom pressure cooker for this.
~ Now strain the water and cook with 4 glasses fresh water,simmer and cook on low till soft.
It will take about 45 min to 1 hour.Keep checking and stirring in between.
~ Add 1/2 cup ginger and garlic paste.
Keep simmering,and add the spices and cook till everything is blended.
For the spices, adjust the red chili powder to your taste
Turmeric 1 tsp
Coriander 3 tsp
Red chili 5 tsp
~Now it is time to add 1 cup tomato puree with salt to taste and 1 pinch sugar.
Let it simmer for 30 min.
~Add 1/2 cup butter and 3 tsp toasted Kasuri Methi
with 2tsp Garam Masala.
Let everything cook on low for another half hour.
Please be patient,it will be totally worth it in the end.
Now your done.Serve with Naan or Tandoori Roti.
T.i.p - Never add coriander leaves to garnish.It ruins the taste of this dish.
I know you will give this one a try.