"This has to be one of the most delicious potato side dishes in the world!..."
INGREDIENTS
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1 tbsp EACH: Olive Oil, Butter
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600g / 1.3lb White Onions, (thinly sliced)
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1/2 tsp Salt
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1/4 tsp Black Pepper
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2 large cloves of Garlic, (finely diced)
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2 tsp Fresh Thyme Leaves
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1kg / 2lb Maris Pipers/Russets, (or other starchy/baking potato)
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600ml / 2 1/2 cups Beef Stock
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2x Beef Oxo/Bouillon Cubes, (crumbled)
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1 tbsp Cornflour/Cornstarch
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1 tsp Worcestershire Sauce
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2 tbsp Butter
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120g / 4oz Gruyere, (grated)
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Salt, (as needed)