Cottage Pie - Vickery TV

Ingredients

• 1 tbsp vegetable oil
• 250 g chestnut mushrooms (very finely chopped (I use a food processor))
• 4 small onions (finely chopped)
• 250 g minced beef (12% fat content)
• 2 tbsp tomato purée
• 1 pinch dried thyme
• 2 tbsp Worcestershire sauce
• 2 yeast extract
• 1 reduced-salt stock cube (½ of a 10g stock cube)
• 250 g frozen mixed vegetables
• 250 g fresh spinach
• 400 g can butter beans
• 400 g frozen mash pellets (defrosted)
• 150 ml hot skimmed milk
• salt and freshly ground black pepper