Piri piri chicken with chunky oven chips

INGREDIENTS

• 2 chicken legs
• 2 large baking potatoes , peeled and cut into chunky chips
• groundnut oil
• mayonnaise , to serve
• 2-3 red chillies , roughly chopped
• 2 garlic cloves , roughly chopped
• a small piece ginger , roughly chopped
• 2 limes , juiced
• 1 tsp ground cinnamon
• 1 tsp ground coriander
• 1 tsp paprika