1. Boil potatoes, 1 tablespoon salt, and 1 tablespoon of vinegar, reserve 1/2 cup of cooking liquid.
2. Immediately toss potatoes with 1/2 tablespoon of vinegar in a bowl, set aside.
3. in a seperate bowl, combine cooking liquid with remaining 1 tablespoon of vinegar, mustard, sugar, minced shallot and 5 to 6 pieces of cooked yukon gold potato and mash until smooth.
4. whisking constantly add 3 tablespoons of olive oil until combined.
5. fold in capers, celery, sliced shallot, parsley and potatoes. season to taste with salt, pepper and more sugar if desired. Serve with remaining tablespoon of olive oil.
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