INGREDIENTS
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4 Tbsp. (1/2 stick) unsalted butter, melted, divided, plus more for pan
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1/2 tsp. caraway seeds*
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2 Tbsp. rendered duck or bacon fat, melted**
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1 tsp. (or more) kosher salt
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1/2 tsp. freshly ground black pepper
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2 lb. medium Yukon Gold potatoes, unpeeled, cut into 1/8″-thick slices with a mandoline or V-slicer
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1 small sweet onion (such as Maui), very thinly sliced