Heat the oil in a saute pan. (I like to use the large one I will cook the final dish in — a deep 12-inch saute pan — to save dishes.) Cook the onions until they are soft, add the carrot, celery and parsnip and saute them for a couple extra minutes — until they are also soft. Season the mixture with salt and pepper, transfer it to a bowl and let it cool a bit. Mix in the meat, rice and tomato paste and season again with salt and pepper.