Mushroom and Beef and Beer Pot Pie

Ingredients

• Salt and pepper
• 2 Tbsp olive oil
• 2 Tbsp butter
• 2 onions, halved and sliced
• 2 carrots, sliced
• 2 celery stalks, sliced
• 2 garlic cloves, sliced
• 250g Small Portabello ‘Casserole’ Mushrooms, thickly sliced
• 2 C (500ml) beer
• 1 Tbsp tomato paste
• 2 potatoes, finely sliced
• 30g butter melted
• 500g braising beef, cubed
• Flour