In a bowl add 1/2 cup warm water, sugar and yeast. Mix well and cover and set aside for 15 minutes.
In another bowl add plain flour and salt. Mix well and add the yeast mix and the rest of the water and make a soft dough. Knead it until it stops sticking to hand. Take oil and rub it in. Leave it to prove for an hour or is double in size.

Add oil in a pan and heat on medium flame. Add cumin and mustard seeds. Once it starts fluttering add onion, ginger and chilli paste. Cook until onion becomes soft and translucent. Add in mashed potatoes, turmeric, chilli powder, salt, lemon juice, garam masala and coriander leaves. Mix well and remove from heat. Let it cool. Make barrel shaped from the mix.

Knead the dough and make 10 to 12 equal balls. Roll one ball dusting some flour and make a cut from the centre. Spread green chutney and sprinkle some dry garlic chutney. Place one bateta vada and roll it in a cone shape. Repeat for the rest and place it on a greased tray. Using a brush do a milk wash on the rolls. Sprinkle some dry garlic chutney. Bake in a preheated oven at 180c for 30 to 35 minutes. Remove and brush some butter on top.