Instructions

Preparation
Firstly prepare all the chutneys and keep aside. i have given links for the recipes in the post.
You can also make the chutneys a day before and refrigerate them.
Boil the potatoes and let them cool.
Once cooled, peel and chop the potatoes.
Chop the onions, tomatoes and coriander leaves finely.
Beat the yogurt (curd) with a wired whisk till smooth.
Making Dahi Puri
In a plate, arrange the puris or golgappas. You decide the number of puris to be served in each plate.
Break the puris from the center to create space for the potatoes and chutneys.
Stuff the chopped potatoes in the pooris.
Now add the chopped onions, tomatoes on top of the potatoes in the puris.
At this stage you could sprinkle some chaat masala, jeera powder, red chili powder and black salt on the puris. This step is optional.
Top the stuffed puris up with the green chutney, sweet chutney and red chutney. Top the chutneys as per your liking and taste.
Add the yogurt in each poori.
Now again sprinkle all the four dry masalas i.e chaat masala, roasted cumin powder, red chili powder and black salt.
Add the sev on top in a way that each poori gets covered with sev. Finally garnish with chopped coriander leaves.
Serve dahi puri chaat as soon as you make it as the puris become soggy if you serve even after a few minutes.