INGREDIENTS
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ONIONS
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3 tablespoons unsalted butter
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3 tablespoons olive oil
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2 1/4 lb. onions (about 4 large), chopped (about 7 cups)
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1/2 teaspoon sugar
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1/2 teaspoon salt
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1/4 teaspoon freshly ground pepper
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POTATOES
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4 lb. russet potatoes (3 to 4 large), peeled, cubed (1 inch)
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3 teaspoons salt, divided
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2/3 cup whole milk
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2 tablespoons unsalted butter
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1/4 teaspoon freshly ground pepper