Start by measuring the peas. If you are using frozen peas, thaw them in a big bowl of water and then strain after 5 minutes. If you are using fresh peas, rinse them in water and drain.
Peel an onion and slice it.
Next, pour oil in a kadhai and wait for it to heat up on medium high. Once hot, throw in the cumin seeds and let them sizzle and bloom for 30 seconds.
Tip in the sliced red onion next and give it a good stir. Cook the onion for 2 minutes and then add the drained green peas.
Stir the peas in the kadhai to coat them in oil. Throw in all the spices and salt and then mix well.
Now turn the heat low and add a few tablespoons of water. Cover the kadhai and let the peas cook in the steam till they are softer. This should take 5-7 minutes.
Uncover the kadhai to check if the peas are done. Once they are cooked, sprinkle some garam masala on top.
Serve this sookhi matar ki sabzi with hot parathas or dal and rice!