- two 10-ounce cans mild enchilada sauce (2 cups)
- 1 cup water
- 2 large garlic cloves, minced and mashed to a paste
- 5 large sweet potatoes (about 3 1/2 pounds)
- 1 1/3 cups coarsely grated Monterey Jack cheese (about 6 ounces)
- Preheat oven to 375°F.
- In a large saucepan simmer enchilada sauce, water, and garlic with salt to taste, stirring occasionally, 5 minutes.
- Peel potatoes and cut crosswise into 1/8-inch-thick slices. In a 3-quart gratin or shallow baking dish layer one fourth of potatoes in concentric circles, overlapping slightly, and sprinkle with 1/3 cup cheese. Continue to layer remaining potatoes and cheese in same manner, ending with cheese.
- Pour sauce slowly over potatoes, letting it seep between layers, and bake gratin set in a shallow baking pan (it may bubble over) in middle of oven 1 hour, or until potatoes are tender. Gratin may be made 2 days ahead and chilled, covered. Reheat gratin, covered, in oven.