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Rub each potato with a little oil and salt, then wrap in a double layer of foil.
As soon as the barbecue coals are glowing red, put the potatoes directly on them. Cook for 15 mins, turn with tongs, then cook for 15 mins more. Remove one, unwrap and check it is cooked through.
Peel back the top of the foil from each potato, split open and top with a spoonful of yogurt and a few spring onion slices.