Heat oil in a 10-inch cast-iron skillet over a medium-high, tilting pan to coat the bottom. Arrange potato wedges and sausage slices in skillet in a single layer, and sprinkle with 1/4 teaspoon salt.
In a deep, 10-inch oven-safe skillet, heat oil over medium-high. Add the onion and garlic and cook, stirring occasionally, until starting to soften, 3 to 5 minutes. Add the beef and sausage and ...