To begin, pour the buttermilk into a blender, and add in the black pepper, mustard, and half the cheese. Process this for a couple of seconds, until everything is well blended and the consistency is creamy and smooth.
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Keep the blender running, and pour in the champagne vinegar. Once this is done, turn the blender off.
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Next, take a medium-sized bowl, and crumble the remainder of the blue cheese into this. Pour the mixture from the blender all over the crumbled cheese.
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Stir this together – remember, the charm of blue cheese dressing is that is it creamy and chunky at the same time, so do not stir too vigorously, and keep the chunks of blue cheese intact.
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Finally, taste the dressing. Adjust the seasonings – add salt if you desire, pour in some more vinegar or lemon juice if you want it to be tangier, or add some buttermilk if you find it too thick and wish to thin it out some more.
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Chill the dressing in the refrigerator, and then pour it over your favourite salad to enjoy.
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