Smoked Salmon Hash

Name: Smoked Salmon Hash
Ingredients: 2 tablespoons extra virgin olive oil; 1 1/2 pounds Yukon gold potatoes , peeled and diced into 1/4-inch cubes; 1 cup onion , chopped; 4 ounces hot- smoked salmon , broken into flakes; 2 tablespoons sour cream; 2 teaspoons prepared horseradish; 1 teaspoon Dijon mustard; 2 tablespoons chopped chives or green onion greens; 1 tablespoon fresh parsley , minced; Salt and black pepper to taste; Lemon wedges and extra sour cream for serving