1) Whisk together the paprika, chilli powder, brown sugar, cumin, garlic, oil, salt and pepper in a small bowl.
2) Place the prawns in a large bowl, add the spice mix and stir well to coat each prawn. Heat the grill on high or place a large frying pan on a high heat.
3) Skewer 1/2 the prawns and cook until just cooked through, 3 to 4 mins. Stir in 1/2 the spring onions and transfer to a large serving plate.
4) Wipe out the pan with paper towels, and repeat with the remaining ingredients. Serve the prawns hot on the skewers.