Tempered Curry-Ginger Sweet Potatoes

My mother grew up in Sri Lanka, but it wasn’t until she emigrated to the United States in the 1970s and started building a family that she began cooking her native cuisine in earnest. When I was old enough, I started paying attention as she prepared elaborate, traditional meals for my family. That’s when I learned about tempering.Tempering is one of the most valuable tenets of Sri Lankan cooking I learned from my mother. The process is quite simple. Whole spices, like cumin and mustard seeds, get a quick swirl in hot oil, toasting them just enough to impart big flavor in minimal time. This flavorful cooking medium is then used as the base for any number of dishes; meats especially get beautiful color when seared in oil heavily flavored by chiles, onion, curry leaves, and ginger. You can also use it at the very end of a recipe. Some of my favorite dishes get a splash of this flavorful oil before serving; it’s a dramatically delicious way to finish a dish.The versatility of the technique can unlock a whole new world of options at your dinner table. It’s a fast way to introduce a balancing element of bitterness, earthiness, or brightness to the simplest of dishes, making it handy for quick weeknight meals.These tempered sweet potatoes illustrate how transformative the technique is. Hearty, filling, and packed with the flavors of my mother’s kitchen—onion, ginger, and chile flakes—they’re my cold-weather go-to. While my mother made this dish with russet potatoes or Yukon golds, I like using sweet potatoes because they are both firm and forgiving, making them ideal for soaking up the chile-and-spice-laden oil.

Active Time:
15 hrs
Total Time:
40 mins


  • 2 1/2 cups water, divided

  • 2 pounds sweet potatoes

  • 1 1/2 teaspoons kosher salt, divided

  • 1/4 cup coconut oil

  • 1 teaspoon black mustard seeds

  • 1 red onion, thinly sliced

  • 1 sprig curry (about 8 small leaves)

  • 2 cinnamon sticks

  • 2 (6-inch) pieces pandan leaf, tied in a knot

  • 2 teaspoons minced peeled fresh ginger

  • 1 banana pepper, thinly sliced into rings and seeded

  • 1 teaspoon ground turmeric

  • 1 teaspoon crushed red pepper

  • Lime wedges, for garnish


  1. Pour 2 cups water into a Dutch oven; add steamer basket. Add sweet potatoes to steamer basket. Cover and bring to a boil over medium-high. Steam potatoes until tender, about 30 minutes. Remove sweet potatoes from pot; rinse under cold water until cool enough to handle. Slice to remove small ends of potatoes; peel potatoes. Cut potatoes into roughly 1- to 1 1/2-inch rounds. Place sweet potato slices on a platter, and sprinkle with 1/2 teaspoon salt.

  2. While sweet potatoes steam, heat coconut oil in a large skillet over medium-high. Add mustard seeds; once they begin to sputter, reduce heat to medium, and add onion, curry leaves, cinnamon sticks, pandan, and ginger. Cook, stirring often, 5 minutes. Add banana pepper; toss until slightly softened, 3 to 5 minutes. Add turmeric, red pepper, remaining 1 teaspoon salt, and remaining 1/2 cup water. Stir well until slightly thickened, about 1 minute. Pour onion mixture over sweet potatoes; squeeze lime wedges over potatoes, if desired.

    Tempered Sweet Potatoes Recipe
    Antonis Achilleos
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