Preheat oven to 400°F or 200°C.
Wash/scrub the sweet potatoes well. Prick with a fork and place on a baking sheet or in an oven-safe dish. Roast for 30-45 minutes or until cooked through and fork tender (depends on how big the potato is).
Combine all dressing ingredients and whisk well to combine. Set aside in the fridge.
Combine red cabbage, tangerine, avocado, and spring onions in a large bowl. Toss to combine. Set aside in the fridge.
In a skillet, heat cooking oil over medium heat. Cook slices in one single layer on both sides until nicely browned and crisp. This will take about 3-5 minutes each side. Allow to cool slightly and chop into small pieces.
When sweet potatoes are ready, and halloumi is cooked, add dressing and chopped halloumi to the salad bowl and stir gently to combine.
Set each roasted sweet potato on a plate. With a sharp knife, cut a slit down the center.
Top with salad and finish with extra lime juice and black pepper if you want.