Method
Mash the boiled sweet potatoes.
Add rock salt and crushed green chilli and roll it.
Wrap it up in an aluminium foil and freeze for 30 mins
Take out from the fridge and cut like tikki.
In a tava, drizzle some oil and roast the tikki till crisp golden brown.

For the dip
Mix hung curd and green chilli.
Serve the hot Sweet Potato Tikki with chilli dip
Note: While crushing chilli add some salt so that when you are preparing the dip you need not add salt..