Homemade Lamb Stock​: a flavour bomb for gravies, sauces, soups

Ingredients

• 60ml extra virgin olive oil
• 2 brown onions, cut into thick slivers
• Salt flakes and freshly ground black pepper, to taste
• 1kg lamb bones (ideally including 1 lamb shank)
• Plain flour, for dusting
• 1½ litres water, or more to cover
• 2 fresh bay leaves, bruised
• ½ teaspoon black peppercorns
• 1 stick cinnamon (broken), 3 allspice berries, 3 bruised green cardamom pods and/or 3 cloves (optional)