In a saucepan, on the side burner (or stove top) over a low heat, melt the butter.
Once the butter has melted add the onion. Fry for a few minutes or until golden and just beginning to soften.
Once the onion is cooked, remove it from the heat, and set aside to cool.
Preheat the barbecue for indirect cooking.
Once the onion is cooled, mix with the remaining ingredients.
To make the stuffing balls roll heaped tablespoons worth of mixture into balls.
Put the stuffing balls into a drip tray that has been lightly greased with butter.
Once the barbecue is preheated turn the outside burners to medium and the centre burner off.
Bake indirectly for 10 to 15 minutes, or until cooked through.