Spiced lamb patties wrapped in pita bread with minted yoghurt sauce

Ingredients

• 750g lamb mince
• 30g roasted pine nuts
• 1 small red onion, finely chopped
• 1 lemon, zested
• ½ bunch mint leaves, chopped
• 1 teaspoon ground cumin
• ½ teaspoon ground cinnamon
• salt
• freshly ground black pepper
• olive oil for grilling
• 200ml thick yoghurt
• 1 Lebanese cucumber, grated
• 2 tablespoons lemon juice
• 100g baby spinach leaves
• 4-6 rounds pita bread