Middle eastern-style pizza

Ingredients

• 2 tablespoon olive oil
• 1 medium brown onion, chopped finely
• 1 clove garlic, crushed
• 500 gram minced lamb or beef
• 1/4 teaspoon cayenne pepper
• 2 teaspoon ground cumin
• 1/2 teaspoon ground cinnamon
• 1 cup (250ml) beef stock
• 2 medium tomatoes, chopped finely
• 1/3 cup (50g) pine nuts, toasted
• 1/4 cup coarsely chopped fresh flat-leaf parsley
• 1/3 cup coarsely chopped fresh mint
• 1 400g afghan bread
• 190 gram jar chilli pesto
• 1 cup (280g) greek-style yogurt
• 1 teaspoon sumac