Watermelon with dukkah dip

INGREDIENTS

• 1 large wedge watermelon , or ½ small watermelon
• olive oil , for brushing
• 25g hazelnuts , skinned
• 25g sesame seeds
• 2½ tsp coriander seeds
• 2 tsp cumin seeds
• 1 tsp sea salt
• ¼ tsp black pepper
• ¼ tsp paprika
• pinch cayenne pepper