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Preheat oven to 180 degrees fan bake.
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Cut your mozzarella into 1 cm cubes, set aside.
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In a large oven proof serving dish pour the tomato passata, add rosemary, sugar and season well. Set aside
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In a large bowl, add the grated onion, garlic, pork mince, sausage meat, cumin, smoked paprika, and breadcrumbs, egg, season well with salt and pepper. Mix well.
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With damp hands, take 2 tablespoons of the meatball mix and with damp hands, place a piece of cheese in the middle and roll into a ball. Make sure the cheese is all encased OR the cheese will leak out when cooking. Repeat until all mix has been rolled into balls. Place the balls into your serving dish into the tomato sauce. Cook in the oven for 30-40 minutes until cooked.
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While the meatballs cook, assemble your taco fillings.
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Pickle your red onion by taking a small bowl, adding the sliced red onion, white sugar and white vinegar, set aside until serving.
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When the meatballs are ready, warm the tacos, place everything on the table and serve!