Fry onions for 10 minutes with lid on with half the oil, until browned.
Add the chopped peppers and continue to stir.
At the same time in a separate pan, fry the meatballs until brown on the outside. When fully browned, remove from heat.
Place garlic into a pile in the middle of the pan. Add the remaining oil and fry for a couple of minutes until lightly browned. Stir with onions.
Add curry paste, stir and fry for a minute.
Pour on chopped tomatoes and stir well.
Add meatballs, stir in well. Put the lid on and simmer until meatballs cooked through. This is usually 5 minutes.
Serve with basmati rice and garnish with coriander.