Lamb Gyro with Onion Salad and Yoghurt Sauce

Ingredients

• 500g lamb mince
• 400g diced lamb shoulder
• 5 cloves garlic
• 1 tablespoon ground cumin
• 1 tablespoon onion powder
• 1 tablespoon dried oregano
• 2 teaspoons ground black pepper
• 1 onions, finely sliced
• 2 tablespoons sumac
• Juice of ½ lemon
• Handful parsley leaves, finely chopped
• 250g plain yoghurt
• 1 teaspoon caster sugar
• 1 teaspoon dried mint
• 6 flatbreads or pitta
• 3 tomatoes, diced
• ½ cucumber, sliced