Put all the ingredients together in a pot and bring to the boil.
Cover and reduce to a simmer for 75 mins stirring occasionally until the gravy is really thick and the onions fall apart in your mouth. Open the gravy for the last 10 mins of cooking to help thicken it.
Use the small maggi cube NOT the bigger jumbo cube. You can cook the gravy for less time depending on your taste. Keep an eye on the gravy toward the end as if too dry add in a tbsp of water.