Preheat the oven to 200 degrees Celsius (392 degrees Fahrenheit), conventional oven.
Peel and dice the root vegetables, place them in a baking dish along with the red onions, and toss everything together with oil and salt/pepper.
Brown the beef in a pot and season with salt, pepper, cumin, and coriander.
Add grated garlic and adjust seasoning to taste.
Pour the beef into the dish and mix with the root vegetables.
Sprinkle grated cheese over the dish and bake for 30 minutes in the oven.
For serving, top with fresh avocado.