Preparation for dal makhani:
Soak both 3/4 cup whole urad dal and 1/4 cup rajma/kidney beans overnight in enough water or for 8 to 9 hours. Later drain them well.
Rinse both the lentils a couple of times in water.
Drain again and then add them in a pressure cooker and add 3 cups water and stir well.

Pressure cook for 18 to 20 whistles on a high flame, till both the urad dal and rajma have cooked thoroughly and softened. If they are not cooked, then add about 1/2 cup water again and pressure cook for 4 to 5 whistles more and then urad dal should melt in the mouth and should not give any bite or resistance when eaten. You can also just mash the urad dal with a spoon or with your fingers to check the softness.

The same rule applies for rajma too. Keep the cooked beans aside.
In a blender or mixer jar, take chopped tomatoes 2 large or 200 grams of tomatoes, chopped.
Blend to a smooth puree and keep it aside. You can also use ready 1 cup tomato puree instead of blending the tomatoes. No need to blanch the tomatoes while pureeing.

Making of the dal makhani:
In a pan, now heat 3 tbsp butter or you can use salted butter or unsalted butter.
Add all the spices - 1/2 tsp cumin seeds, 2 to 3 cloves, 2 to 3 green cardamoms, 1 black cardamom, 1 inch cinnamon, 1 small to medium tej patta/bay leaf.

Saute till the spices become aromatic.
then add 1/2 cup finely chopped onions.
Stir and saute the onions on a low flame often till they become light golden. Then add 2 tsp ginger garlic paste. Stir again and saute till the raw aroma of ginger-garlic goes away.

Add 1 tsp chopped green chilies and stir for a minute. Then add the tomato puree and stir again. Add 1/2 tsp red chili powder and 2 to 3 pinches of grated nutmeg or nutmeg powder. Stir very well and saute this mixture on a low to medium flame, till you see fat releasing from the sides.

Then add the cooked urad dal and rajma beans along with the stock and also add 1 cup water or as required. Cook slow and stir very well and simmer the dal makhani uncovered on a low flame. Keep on stirring often, so that the lentils don't stuck to the bottom of the pan.

Once it has begun to thicken, add salt as required.
stir very well and continue to simmer on a low flame. when simmering you can add more water if the gravy looks thick or dry. The longer you keep dal makhani to simmer, the better it tastes. I kept it for about an overall 25 minutes on a low flame. Do keep on stirring at intervals.

When the gravy has thickened enough, then add 1/4 to 1/3 cup cream. Dal makhani is not too thick or too thin. It has a medium consistency.
stir the cream very well. Then switch off the flame.

Now add 1/4 tsp kasuri methi, crushed. Stir again and cover it and keep the dal makhani aside, if you are proceeding to the dhungar method or else you can serve dal makhni straight away.