INGREDIENTS
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2 tbsp olive oil
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2 lb. lean minced beef
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Sea salt and black pepper
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3 medium onions, peeled and finely chopped
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2 garlic cloves, peeled and finely chopped
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Few thyme sprigs, leaves only
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2 plum tomatoes, chopped
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2 tbsp tomato purée
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1-1/3 cup bottled Guinness
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5 tbsp Worcestershire sauce
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1-1/4 cup chicken stock
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1 kg floury potatoes, such as Maris Piper or King Edward, peeled and roughly cubed
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1-3/4 oz. butter
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2 tbsp finely grated Parmesan or cheddar, plus extra for grating
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1 large egg yolk