Vegetable Latkes

Name: Vegetable Latkes
Ingredients: 2 carrots (5 1/2 ounces); 2 parsnips (11 1/2 ounces); 1 Idaho potato (1 pound); 3 scallions, thinly sliced, white and light-green parts only; 1/4 cup all-purpose flour; Salt and freshly ground black pepper; 2 large eggs, lightly beaten; 2 tablespoons vegetable oil; Sour cream, for garnish