Spicy butterflied chicken with sweet potato wedges

• 1 whole chicken 1.6kg | 3.5 pounds
• 3 lemons halved
• 1 bulb garlic halved horizontally
• 6 large sweet potatoes scrubbed clean, sliced into chunky wedges
• Olive oil to drizzle
• Freshly ground pepper to season

For the spice rub

• 1 tbsp smoked paprika
• 1 1/2 tsp salt
• 1 tsp dried chilli flakes
• 1 tsp fennel seeds
• 1 tsp dried oregano
• 1/2 tsp chilli powder
• 1/2 tsp ground cumin
• 1/2 tsp garlic granules or powder
• 1/2 tsp ground turmeric