While lentils cook, heat remaining oil in a skillet. Add bread and sauté over medium heat until lightly browned and crispy. Remove to a bowl. Add kielbasa to pan and sauté until lightly browned. Place in bowl with croutons, add parsley and toss. Set aside.
03Purée lentils in a food processor in several batches, but do not allow to become perfectly smooth. Return to pot and reheat. If soup is too thick, add 1 cup or more of stock. Season to taste with salt and stir in sherry. Serve, topping each portion with kielbasa and crouton mixture.