Place the chicken cubes in a shallow dish. Whisk together the lemon juice, wine, olive oil, oregano, salt, if using, and white pepper. Pour over the chicken. Cover and refrigerate for at least 1 hour or overnight.
Preheat the oven to 450 degrees F.
Spread the potatoes in a shallow roasting pan. Roast for 15 minutes. Add the chicken with its marinade. Cover with foil and bake for 30 minutes. Uncover, stir the potato-chicken mixture, and continue to bake for another 15 minutes. Remove from the oven and let stand for 5 minutes before dividing among 4 heated dinner plates. Serve with a Vegetable Stack alongside.
Place the carrot slices and squash strips in a vegetable steamer over simmering water. Cover and steam for 2 minutes. Add the snow peas to the steamer and continue to steam for another 1 to 2 minutes, until all the vegetables are crisp-tender.
Divide the snow peas among the 4 dinner plates, arranging closely together lengthwise to form a flat base. Arrange the carrot slices on top of the snow peas and top with the strips of squash in the same direction as the snow peas. Serve hot.
Recipe courtesy Maha Jeha Arnondin, Frances Towner Giedt and Bonnie Sanders Polin, Ph.D, The Joslin Diabetes Great Chefs Cook Healthy Cookbook, Simon and Schuster, 2002