You can use the canned (cooked Rajma ) which you get in the grocery stores Or Soak the uncooked rajma in water for about 6 - 8 hours and then Pressure cook them (for 1 cup rajma use 3 -4 cups of water) with 1 tsp of salt until you get 3 -4 whistles.
Onion - 1
Tomato - 2
Coriander powder - 1 tsp
Dried Methi leaves - ¼ tsp
Chana powder - 3 tsp
Chilli powder - 2 tsp
Ginger & galic paste - 3 tsp
Red chilli & green chilli paste - 3 tsp
Jeera - ¼ tsp
Salt to taste
Garam masala - 2 tsp
Heat some oil in a pan add the Jeera, onions and fry them till they are golden brown, now add the dried methi leaves, and add the tomatoes. After they are cooked
Add the ginger garlic paste and the chilli pastes, Then after they come to a boil add the cooked rajma , For rajma you can add chana powder,to enhance flavor, chilli powder, coriander powder and let them boil for about 40 minutes in simmer
Finally serve them with some lemon juice, onion and coriander leaves.