Cottage Pie

WHAT YOU'LL NEED

• 1 tbsp vegetable oil
• 1 onion, chopped
• 1 celery stick, finely diced
• 1 clove garlic, finely chopped
• 500 g lean beef mince
• 1 tsp flour
• 2 tbsp tomato puree
• 1 tbsp Worcestershire sauce
• 1 Knorr Beef Stock Pot dissolved 400 millilitres boiling water
• 1 bay leaf
• 3 sprigs thyme
• 2 carrots, diced
• 700 g potatoes, peeled and quartered
• 70 ml semi-skimmed milk, warmed
• 30 g Flora Buttery
• A pinch of nutmeg
• 30 g cheddar cheese, grated