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Rainbow Vegetable Gratin
Ingredients
  • 1 tablespoon olive oil, for greasing
  • 1 cup panko
  • 3 ounces Parmigiano-Reggiano cheese, grated (about ¾ cup)
  • 2 tablespoons chopped fresh thyme
  • 2 ½ teaspoons kosher salt, divided
  • ½ teaspoon plus 5 pinches black pepper, divided
  • 1 large red onion
  • 2 medium-size Yukon gold potatoes, unpeeled, sliced crosswise into ⅛-inch-thick slices (about 2 cups)
  • 1 medium-size purple or orange sweet potato, peeled and sliced crosswise into ⅛-inch-thick slices (about 2 cups)
  • 1 large zucchini, sliced crosswise into ⅛-inch-thick rounds (about 2 ½ cups)
  • 1 large yellow squash, sliced crosswise into ⅛-inch-thick rounds (about 2 ½ cups)
  • 2 large heirloom tomatoes (about 1 ½ pounds), sliced crosswise into ¼-inch-thick slices (about 3 cups)
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