Roasted Potatoes with Garlic, Orange, and Mustard

As with many of the new dishes my mother added to her repertoire, this dish entered our house via an acquaintance at the hairdresser’s salon—a place of serious culinary exchange in Greece. This is my mother’s variation on the classic lemon-oregano potatoes that traditionally accompany roasted meat and poultry; I always preferred these to the main dish. I make the potatoes spicier with the addition of hot red pepper, cumin, and turmeric, and I often mix the potatoes with fruit or other