Grind all the ingredients with little water until smooth paste is formed. Place this aside.Boil tamarind or dates in water for 3-4 mins.Allow to cool and remove if they have any seed. Grind them together with a cup of water until smooth.Take a pan add the puree of dates and tamarind.Add ½ cup water and mix all nicely.Also add jaggery powder and all spice powder, mix and simmer for 4-5 mins.Allow to thicken then switch off the gas. Place aside to cool.Spread some puris/ padis over a dish.Top with some mashed potatoes.Now top some chopped onion, raw mangoes and tomatoes.Pour some green chutney and sweet chutney as you prefer spicy or sweet.Sprinkle sev, roasted peanuts, chat masala, chopped coriander leaves, black salt and squeeze some lime juice all over.Serve the sev puris immediately.