To make jhal muri, we need crisp puffed rice. If they are not crisp then you can dry roast them in a pan for few minutes. Set them aside.
Boil potato until just cooked. Cube them and set aside.
Dry roast peanuts and remove the skin. Set these aside.
Chop tomatoes, onions, green chilies and coriander leaves
To a mixing bowl add tomatoes, cucumber, onions, potatoes, coriander leaves and green chilies.
Add salt,red chili powder, cumin powder and chaat masala.
Squeeze the lemon. Give them a good stir.
Add peanuts and puffed rice.
Toss them all. You can add some more puffed rice if the mixture is moist. Then add chanachur or sev.
Serve jhal muri immediately.