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Potato, Apple And Onion Gratin

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Potato, Apple And Onion Gratin

Ingredients

  • 6 t unsalted butter, at room temperature, divided
  • 1 lb red onions, peeled, halved &; sliced
  • 1 t chopped fresh rosemary leaves
  • 3 t kosher salt, divided
  • 1/3 c water
  • 1/3 c dry white wine
  • 1 1/2 lb klondike rose, or similar idaho potatoes, sliced into 1/4-inch rounds
  • 1 lb tart red apples (such as granny smith, pippin, or pink lady), peeled, halved, cored, cut into 1/4-inch-thick slices
  • 1/2 t freshly cracked black pepper
  • 1/4 c dried bread crumbs
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