Shepherd's pie

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Ingredients

• 800 gpotatoes, peeled and cut into chunks
• 30 gbutter
• 75 mlmilk
• 500 glamb mince
• 1onion, finely chopped
• 2carrots, finely diced
• 1 tbspplain flour
• 1 tbsptomato purée
• 300 mllamb stock
• 1 tbspWorcestershire sauce
• 100 gfrozen peas
• salt and black pepper, to taste