Corned Beef Hash

Name: Corned Beef Hash
Ingredients: 500 g sebago (starchy) potatoes, peeled and grated; 1 quantity corned beef+; 2 eggs, lightly beaten; 2 green onions (scallions), sliced; 1 tablespoon store-bought, grated horseradish; 2 tablespoons olive oil; 20 g butter; 2 vine-ripened tomatoes, chopped; ½ cup flat-leaf parsley leaves; 1 tablespoon red wine vinegar; sea salt and cracked black pepper