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Steam potatoes until they are tender when pierced with a knife. When the potatoes are cool enough to handle, cut into halves or fourths depending upon the side of the potato.
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Whisk mayonnaise, buttermilk, mustards, 1 t. salt salt and 1 t. pepper together. Set aside.
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Assemble salad by mixing the warm steamed potatoes with the buttermilk dressing. Let the potatoes sit for a while so that they can absorb some of the dressing. Add celery and red onion, salt and pepper to taste. Toss.
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Cover the salad and refrigerate overnight. Garnish and serve at room temperature.