Guinness Lamb Shanks - Deliciously Yorkshire

Ingredients

• 6 lamb shanks, about 5lbs in total
• Kosher Salt and freshly ground pepper
• 2 tbsp olive oil
• 12 white pearl onions, peeled
• 2 large carrots, peeled and cut into ¼ inch thick slices
• 4 garlic cloves, thickly sliced
• 3 sprigs fresh thyme
• 1 cup canned tomatoes, drained and crushed
• Cups (500 ml can) Guinness
• Chicken Stock, enough to reach halfway up the meat
• 1lb fresh potatoes
• 3 cups button mushrooms, larger ones halved