Fry the onions till they become golden brown while stirring continuously.
Add flour while stirring and cook for 2 minutes.
(*For making veg: stock:
Mix everything in a pressure cooker, cover it with lid and boil for 15 minutes. If you want to make a clear soup, don`t mash it. Turn off the gas. Strain using a strainer. Use the liquid for making soup.)
Add the stock and bring to a boil.