Peel carrots and potatoes cleanly and chop them into smaller pieces. Then wash them in clear water for 2 to 3 times and set them aside.
Then take a 2 or 3-liter pressure cooker that you have on a stovetop on a medium heat. Add 1.5 tbsp mustard oil and heat it.
When the oil heats add 1 tsp cumin seeds in it and saute them.
When the cumin seeds start spluttering, add 1/2 tsp coriander seed powder, 1/2 tsp fennel seed powder, and chopped green chili. Stir and saute them.
Add chopped carrots and potatoes with 1/3 tsp turmeric powder and salt as required.
Then add 1 tbsp water to it.
Mix all these ingredients well close the cooker lid and wait until 1 whistle comes and before the second whistles come turn off the flame.
When pressure comes down naturally open the lid and you see some water is still in the sabji.
Then cook it on low to medium heat without closing the lid until the water absorbs properly. There is no water in its final preparation.
At last, add 1/4 tsp garam masala powder and 1 tbsp chopped coriander leaves.
Mix all the ingredients well and turn off the flame.
Now the aloo gajar sabji is ready. Serve it hot or warm with phulka or paratha as you like.