INGREDIENTS 1/4 cup  chopped shallots 2 Tbsp  finely chopped fresh parsley 2 Tbsp  capers, rinsed and chopped 1/4 cup  lemon juice 2 Tbsp  dry white wine 2 Tbsp  extra-virgin olive oil 2 tsp  Dijon mustard 1 pound  yellow-fleshed potatoes, such as Yukon Gold, peeled and sliced 1/8 inch…