Heze mutton soup

Ingredients

• 1 kg goat or mutton bones (with some meat)
• 3L water
• 5 slices ginger
• 3 scallions (tied in a knot)
• 2 tbsp cooking wine
• 1 tsp white pepper
• Salt to taste
• Serving: flatbread (guokui), cilantro, chili oil