Sweet Potato Gratin with Caramelized Onions

Sweet Potato Gratin with Caramelized Onions
Photo by Scott Phillips

Ingredients

  • 2 lb. yellow onions, thinly sliced (about 6 cups)
  • ½ Tbs. freshly grated orange zest (from 1 orange)
  • ½ tsp. freshly ground black pepper, more to taste
  • 2 oz. (4 Tbs.) unsalted butter; more for the baking dish
  • 2 Tbs. fresh breadcrumbs
  • 2 cups heavy cream
  • 4 lb. sweet potatoes (about 5 medium)
  • + 5 more ingredients
    • 3 sprigs fresh thyme
    • ½ tsp. kosher salt; more to taste
    • 1 cup (4 oz.) pecan halves, toasted
    • 1/8 tsp. cayenne
    • 2 Tbs. freshly grated Parmigiano-Reggiano

Heat the butter in a heavy-based 12-inch skillet over medium heat until it begins to foam. Add the onions, reduce the heat to medium low, and cook slowly, stirring occasionally, until the onions are soft and nicely browned, 30 to 40 minutes. Season with the 1/2 tsp. each salt and pepper. Remove f...

View full recipe at Fine Cooking

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