Quick and easy barbecue spiced prawns recipe

Ingredients

• 1 small onion, finely chopped
• 1 tablespoon olive oil
• 1 tablespoon lemon juice
• 1 tablespoon chopped parsley
• 1 tablespoon chopped coriander
• 2 teaspoons ground cumin
• 1 garlic clove, crushed
• 1 teaspoon turmeric
• 1/2 teaspoon paprika
• 1 kilogram green prawns, peeled (tails left intact), deveined
• prepared couscous, natural yoghurt, mixed salad leaves, to serve