Moroccan lamb shanks

4 lamb shanks

2 tbsp olive oil

1 large onion, peeled and diced

5 garlic cloves, peeled and minced

1 heaped tbsp grated fresh ginger (use a pestle and mortar)

1 tsp ground cumin

1 tbsp ground coriander

½ tsp crushed red pepper (or Aleppo pepper)

1 medium cinnamon stick

½ to 1 preserved lemon, rinsed and diced

4 – 6 prunes

1 x 400g (14oz) tinned tomatoes, crushed or chopped

salt to taste

lemon or lime (optional)