In a large pot add the chopped tomatoes and olive oil and put on low to medium heat. Add salt and pepper to taste and let it simmer while you prepare the rest of the meal.
Preheat your oven to 200°C / 392°F.
In a large pan heat a couple of cups of neutral oil for frying. I always make sure to have it around one inch deep for this dish.
In a large bowl combine the meat, onion, garlic, egg, bread crumbs, parsley, salt and pepper. Mix well.
Slightly wet your hands, form the meatballs and stuff each one with a small piece of feta cheese.
Coat the meatballs lightly in flour and fry them until they are brown and crispy on all sides.
While the meatballs fry, peel the sweet potato and cut it into strips.
Line a baking sheet with baking parchment. Add the sweet potatoes, rosemary, thymeand a generous pinch of salt and pepper. Coat everything a tablespoon of olive oil and roast in the oven for around 20 min.
When the meatballs are done, take them out of the frying pan and add them to the pot with the tomato sauce. Cook together for another 10 min.