Beef and barley casserole

Ingredients

• 1.5kg gravy beef, excess fat trimmed (see tip)
• ¼ cup (40g) plain flour
• Salt and freshly ground black pepper, to season
• 2 tablespoons olive oil
• 350g piece speck, cut into 1cm pieces (see tip)
• 300g mixed mushrooms, larger mushrooms halved
• 2 onions, chopped coarsely
• 2 large carrots, halved lengthways, sliced thickly
• 2 trimmed celery stalks, chopped coarsely
• 1 cup (250ml) dry red wine
• 6 sprigs fresh thyme
• 2 fresh bay leaves
• 1 litre (4 cups) beef stock
• ½ cup (100g) pearl barley, rinsed
• 1 bunch kale (250g), stalks removed, leaves torn coarsely