D and I went out o find Vada pav and we found this. So...get them young and green. Wipe each vadu with a dry cloth dipped in castor oil (haha no..didn't have, but that's the wisdom). Salt them in layers. Add a bit ( a wee bit so as not to be jaundiced) of turmeric...curcumin yayyy. And leave it out in the sun. Jiggle bottle twice during the sunbathing. In 3 days, they'll start to wrinkle just a bit. They should remain plump(ish) if they are good vadus. It's important to see no fungus grows. When it's done, it's done. You can add some mustard powder and some chilli powder. But also just have them as they are. With TS :) I remember one year, we sat in Vidya's house in Madurai and made Jadis and Jadis of vadu. Her mum makes it best ones. Btw D...do you remember the counter top?
