Sweet Potato & Walnut Gratin with Melted Cheddar

Author

Lior Lev Sercarz, from "Mastering Spice" by Lior Lev Sercarz

Servings

4 to 6

Category

Side Dish

Ingredients

• 1 1/4 teaspoons cumin seeds (4 grams)
• 2 teaspoons dried garlic slices (3 grams)
• 1/2 teaspoon caraway seeds (2 grams)
• 1/2 teaspoon ground ginger (1 gram)
• 1/4 teaspoon cayenne pepper (1/2 gram)
• Finely grind the cumin, garlic, and caraway together and immediately mix with the ginger
• Extra-virgin olive oil
• 1 medium yellow onion, halved and very thinly sliced
• Kosher salt
• 11⁄2 pounds sweet potatoes (about 2 large), peeled and cut into 1⁄2-inch chunks
• 1⁄2 cup fresh orange juice
• 1/2 cup chopped toasted walnuts
• 1 cup cheddar cheese, grated

Directions

1. Preheat oven to 400F. Generously coat the bottom of a large saucepan with oil (1 to 2 tablespoons). Add the spice blend and set the heat to medium. Cook, stirring continuously, until tiny bubbles break the surface, 1 to 2 minutes.
2. Add the onion, season generously with salt, and stir well to evenly coat. Cover and cook, stirring occasionally, until the onion tenderizes a bit, 5 to 6 minutes.
3. Add the sweet potatoes, stir well to evenly coat, and cover. Reduce the heat to medium-low and cook, stirring often to prevent the spices from burning and the sweet potatoes from sticking, until the sweet potatoes start to break down into a semi-chunky mash, 13 to 15 minutes.
4. Stir in the orange juice, cover, and cook until the remaining sweet potato chunks are soft, 5 to 6 minutes. If all the liquid has evaporated before the sweet potatoes are soft, add water to the pan, 1 tablespoon at a time, to keep the mixture from drying out and burning. Remove from the heat.
5. Using an immersion or stand blender, food processor, or food mill, puree the sweet potatoes until smooth. Fold in 2 tablespoons oil and the walnuts, then season to taste with salt.
6. Spread mixture in a shallow 1 1/2 quart baking disk. Sprinkled the top with cheese. Bake until the cheese is golden brown, about 15 minutes. Serve warm.