Preheat the oven to 425 degrees F. Put the olive oil, lemon juice, shallot, garlic, oregano and parsley in a food processor; add 1 teaspoon salt, and pepper to taste. Puree until mostly smooth.
Toss the potatoes with 1/2 cup of the prepared vinaigrette in a large bowl and spread in a single layer on a large rimmed baking sheet. (Reserve the remaining vinaigrette.) Roast the potatoes until tender and golden, turning occasionally, 45 minutes to 1 hour.
Transfer the potatoes to a platter and drizzle with some of the remaining vinaigrette. Season with salt and garnish with the chopped parsley. Serve with the remaining vinaigrette on the side.
Photograph by Yunhee Kim
Courtesy of Food Network Magazine