Heat 2 tbsp of cooking oil in a kadai. When it is hot, put in 6 pieces of cashew nuts, 1 finely chopped medium-sized onion, 1 finely chopped green chili, and salt to taste. Fry them on a medium to high flame until the onions turn to a nice golden-brown color.
At this stage, add chopped pieces of two medium-sized tomatoes to it. Mix, cover, and cook them nicely until soft.
While the tomatoes cook, put 1.5 cups of green peas (matar), 3 cups of water, ½ tsp of salt, and ½ tsp of sugar in a separate pan. Cover the pan and let the peas boil.
By this time, the tomatoes will be half cooked. At this stage, add ½ tsp of turmeric powder, 1 tsp of coriander powder, ½ tsp of dry mango powder (amchur), ½ tsp of cumin seed powder, and ¼ tsp of red chili powder (optional) to it. Mix well and let it cook for 2 to 3 minutes more until soft. Transfer it to a mixie jar and keep aside to cool down.
Check the matar for its doneness. Strain it if done and immediately put them in a bowl of ice water. Keep it aside.
Now, put 1.5 cups of finely chopped methi leaves in the kadai. Stir and fry for 2 to 3 minutes until it reduces. Transfer it to a plate to cool down.
Now, put ½ cup of water to the masala in the mixie jar and make a very smooth paste of it. Keep it aside.
Now, heat 1 tbsp of cooking oil in the kadai over a medium flame and put ½ tsp of cumin seeds and 1 piece of black cardamom (seeds only). Let them crackle for a few seconds before adding the masala paste. Let it come to a boil.
Now add the boiled green peas and then the fried methi leaves to it. Mix nicely and let them cook for about a minute or so.
Now, take a bit of this gravy and add to a cup of milk. Mix nicely and then add it to the gravy. Stir the gravy continuously for a few seconds and then cover and let it cook for 3 to 4 minutes more over a medium flame.
Check the thickness of the gravy and then add ½ tsp of garam masala powder and ½ tsp of crushed kasuri methi in it. Follow it up with 4 tbsp of malai (preferably homemade) and give it a nice final mix. Cover and cook for a minute or so.
Your tasty and creamy methi malai matar is ready to enjoy. Transfer it to a serving bowl and enjoy hot with roti or paratha.