(You may need to do this in batches.) Transfer the meatballs to a large lidded saucepan. To make the gravy, heat the sunflower oil in the frying pan and gently fry the onion over a low heat for ...

If this sounds a bit off-putting, keep in mind that the topping is similar to a roux or gravy ... Campbell's soon introduced three other recipes: Creole burgers, onion burgers, and meatballs ...