Preheat the oven to 180 degrees Celsius.In a pan on medium heat, brown the mince - do not add any extra oil. Keep stirring to prevent it from sticking to the pan.Once the meat has browned, add the garlic, spice and the tomato and onion mix.Allow to simmer for about 30 minutes until the mixture appears thick and almost syrupy.To make the tacos: place a ¼ cup of cheese per taco on a baking tray lined with baking paper. Make sure there is enough room around them to avoid them melting into each other.Bake in the oven until just melted (about 5-7 minutes).Remove from the oven, and allow to cool slightly before peeling from the tray.To form into taco shells: drape over something like a big knife handle or rolling pin held up by 2 cups.Once completely cooled, fill the cheese tacos with desired toppings and the spicy beef mince.Enjoy!