French Onion Potato Gratin

Name: French Onion Potato Gratin
Yield: Serves 8 to 10
Ingredients: ½ cup, panko bread crumbs; 4 tablespoons, unsalted butter, melted, divided, plus 4 tablespoons unsalted butter; 6 ounces, Gruyère cheese, shredded (1½ cups); 8 , sprigs fresh thyme, plus 1 teaspoon fresh thyme leaves; ¾ teaspoon, pepper, divided; 4 , onions, sliced thin (4 cups); ¼ cup, water; 1 tablespoon, packed brown sugar; 2 teaspoons, table salt, divided; 4 , garlic cloves, minced; 2 cups, beef broth; ½ cup, dry sherry; 3 tablespoons, Worcestershire sauce; 2 tablespoons, Dijon mustard; 4 pounds, Yukon gold potatoes, peeled and sliced thin

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Appears in Cook's Country December/January 2024

To make a potato gratin even more comforting, give it the French onion treatment.

SERVES8 to 10

TIME2 hours, plus 30 minutes cooling

WHY THIS RECIPE WORKS

To take a delicious potato gratin over the top, we added elements found in French onion soup. We started by caramelizing onions, cooking them with water, salt, and butter in a covered pan to speed up the process; the steam helped break down...

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