Sorry if I wasn't clear, I don't mean fry the onions first , I mean put in a big pot , fill with white onions peeled but whole and only add water and oil and boil until the onions have turned brown, I imagine this will take anywhere from 3-6 hours, I have seen the Ashoka kitchen making their base and they start it at 10am as I was in the kitchen having a cooking lesson about 5 yrs ago now
Will try this at some point as nothing to lose I guess