Flatbread Pizzas with Ground Meat (Lahmajoun)

Ingredients

• • 1/2 lb (225 g) lean ground beef
  • 1 tbsp (15 ml) olive oil
  • 1 small onion, chopped
  • 1 garlic clove, chopped
  • 1 tbsp sweet paprika
  • 1/2 tsp ground allspice
  • 1 tomato, seeded and chopped
  • 2 tbsp (30 ml) plain yogurt
  • 1 tbsp flat-leaf parsley, finely chopped, plus more for garnish
  • 1 tbsp mint, finely chopped, plus more for garnish
  • 4 Greek pitas or naan breads, about 8 inches (20 cm) in diameter