3 pounds sweet potatoes, peeled and cut into 1½-inch chunks
1 tablespoon chopped ginger
¼ cup vegetable oil
Salt and freshly ground pepper
4 ounces shiitake mushrooms, stems removed and quartered
¼ cup chopped green onions
2 tablespoons lemon juice
Preheat oven to 425 F.
Place sweet potatoes in an 8-by-10-inch baking dish. Add ginger, vegetable oil, salt and pepper and toss to coat.
Bake for 15 minutes. Use a spatula to turn potatoes so they brown evenly. Add shiitake mushrooms and bake for 5 to 10 minutes longer, or until potatoes are browned and mushrooms are cooked.
Remove from oven. Add green onions and lemon juice. Toss to combine.