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1
Preheat the oven to 220u00b0C/gas 7.
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2
First make the Yorkshire pudding. Heat the lard in a large shallow, round roasting tray in the oven until very hot.
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3
Meanwhile, whisk together the flour, eggs and milk to form a smooth, lump-free batter. Pour the batter into the hot roasting tray and roast until well-risen, around 20-30 minutes. Remove the Yorkshire pudding, keeping it in the tray, and set aside.
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4
Reduce the oven temperature to 180u00b0C/gas.
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5
Place the sausages in a greased oven tray and bake them for 30 minutes until cooked through, turning now and then so that they colour evenly. Half-way through the sausage's baking time, return the Yorkshire pudding to the oven and heat through for 15 minutes until hot and crisp.
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6
Meanwhile, cook the cubed potatoes in boiling salted water until tender. Drain, add in the milk and butter and season with salt and freshly ground pepper. Beat with a hand whisk until smooth and creamy. Stir through the creamed horseradish.
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7
To make the onion gravy, gently heat the butter and olive oil in a frying pan. When hot, add the onions and begin to fry gently. After five minutes, add the chopped sage and garlic. On a gentle heat, add in the Marsala wine and turn up the heat so that everything begins to bubble.
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8
Sniff the pan and see if alcohol smell has evaporated. If it has, turn the heat down. Stir the mustard into the pan and cook for a final 5 minutes.
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9
To serve, turn out the crisped Yorkshire pudding from its tin. Place on a plate, fill with a generous serve of mash, stick several sausages into the mash pile and cover the bangers and mash with lashings of the onion gravy!