In a large bowl mix the minced beef with the herbs, onion and seasoning.
Mould them into 8 flat patties with your hands and set aside at room temperature.
Preheat the oven to 200C.
Brush the chopped sweet potato with a slight amount of olive oil and season with a light sprinkle of sea salt. Place them in the oven to cook for 20 - 25 minutes.
Heat a grill pan and sear the patties for 3 minutes each side. Place them on the lower in the oven to cook through for a further 12 - 15 minutes.
serve with a spoon of salsa and steamed greens.