Lamb Shank Soup

Warm up winter weeknights with this slow-cooker soup - its packed with warming spices and tender lamb shanks, plus its low-cal and gluten-free!The ingredient of Lamb Shank Soup2 teaspoons extra virgin olive oil2 large 700g french trimmed lamb shanks1 large brown onion finely chopped1 carrot peeled finely chopped2 celery sticks finely chopped2 garlic cloves crushed2