Directions:
- Roast chiles and make rajas: Roast chiles on their sides on racks of gas burners on high, turning with tongs, until skins are blackened all over, about 10 minutes. Immediately transfer to a bowl and let stand, covered tightly, 10 minutes.
- When chiles are cool enough to handle, peel or rub off skin. Slit chiles lengthwise, then stem, seed, and devein. Cut lengthwise into thin strips.
- Cook onions with 1 teaspoon salt in oil in a 12-inch heavy skillet over medium-low heat, stirring occasionally, until golden, about 8 minutes. Stir in chiles and remove rajas from heat. Reserve 1/2 cup rajas for topping.
- Make gratin: Preheat oven to 400°F with rack in middle. Generously butter a 3-quart shallow baking dish.
- Peel potatoes, then cut crosswise into 1/16-inch-thick slices with slicer. Transfer to a small heavy pot. Add cream, milk, and 1 teaspoon salt and bring just to a boil over medium heat, stirring occasionally (liquid will thicken). Stir in rajas, then pour mixture evenly into baking dish. Sprinkle reserved 1/2 cup rajas on top.
- Bake until potatoes are tender, 45 minutes to 1 hour. Let stand 15 minutes before serving.
- Cooks notes: Chiles can be roasted by broiling on a broiler pan 2 inches from heat, turning, 8 to 10 minutes. Rajas can be made 3 days ahead and chilled. Gratin can be made 1 day ahead and chilled. Bring to room temperature and reheat, covered, in a 350°F oven (about 30 minutes).
Nutrition Facts
| Amount Per 1 Serving | |||
| Calories | 494.59 Kcal (2071 kJ) | ||
| Calories from fat | 172.22 Kcal | ||
| % Daily Value* | |||
| Total Fat | 19.14g | 29% | |
|---|---|---|---|
| Cholesterol | 31.28mg | 10% | |
| Sodium | 20.46mg | 1% | |
| Potassium | 848.03mg | 18% | |
| Total Carbs | 73.98g | 25% | |
| Sugars | 5.12g | 20% | |
| Dietary Fiber | 2.83g | 11% | |
| Protein | 11.18g | 22% | |
| Vitamin C | 34.8mg | 58% | |
| Iron | 137.8mg | 765% | |
| Calcium | 79.5mg | 8% | |
| Amount Per 100 g | |||
| Calories | 137.79 Kcal (577 kJ) | ||
| Calories from fat | 47.98 Kcal | ||
| % Daily Value* | |||
| Total Fat | 5.33g | 29% | |
|---|---|---|---|
| Cholesterol | 8.72mg | 10% | |
| Sodium | 5.7mg | 1% | |
| Potassium | 236.25mg | 18% | |
| Total Carbs | 20.61g | 25% | |
| Sugars | 1.43g | 20% | |
| Dietary Fiber | 0.79g | 11% | |
| Protein | 3.11g | 22% | |
| Vitamin C | 9.7mg | 58% | |
| Iron | 38.4mg | 765% | |
| Calcium | 22.1mg | 8% | |
* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.
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