Lamb mince stuffed peppers with yogurt and sumac

Ingredients

• 1 tsp coriander seeds
• 1 tsp cumin seeds
• 1 tsp fennel seeds
• ½ tsp black peppercorns
• ¼ tsp fine salt
• ½ tsp cayenne pepper
• 600g lamb mince
• 3 garlic cloves, minced
• 2 tbsp harissa
• 100g panko breadcrumbs
• 4 small peppers (any colour)
• 1 tbsp olive oil
• 270ml chicken stock
• 200g couscous
• ½ bunch mint
• ½ bunch coriander
• 80g pomegranate seeds
• 4 tbsp natural yogurt
• Pinch sumac (optional)