First boil ½ kg potato and peel it and mash it with the help of fork.
Then add 3 tbsp rice flour, 2 lemon juice, 1 tbsp mustard seed powder, 1 tsp black pepper crushed, 1 tsp roasted white cumin powder, 4 chopped green chilies, ½ bunch chopped mint, ½ bunch chopped green coriander and salt to taste to mix and grease palm bind them into patties.
Heat little oil on a flat pan and toast all patties. Now toast 4 to 6 buns and pour 1 tbsp oil on each side of bun slice.
Then place patty on bun with tamarind chutney, tomato slice and onion and serve. For tamarind chutney in 1 cup tamarind paste add 1 tbsp dry garlic powder, 1 tsp roasted white cumin powder, salt to taste and 1 pinch black cumin to mix and serve.