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Slice the bread in half lengthwise. Toast the crust side for 2 mins until really crispy. Mix together butter, garlic and parsley in a bowl. Spread over the cut bread halves. Sprinkle over the Parmesan. Just before serving place on a baking sheet, then cook under a hot grill for 5 mins until toasty and lightly golden. Let it cool for 1 min before cutting into thick slices.