"Pockets of caramelized onion and cheese? Yes, please!..."
INGREDIENTS
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For the onions and meatballs:
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2 tablespoons olive oil, divided
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1 large sweet onion, halved and thinly sliced
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1 teaspoon dried thyme, divided
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1/4 cup beef broth
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1/4 cup red wine
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1 1/2 lbs ground beef
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1/4 cup breadcrumbs
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1 large egg, beaten
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8 oz Gruyere or Swiss cheese, 2 oz cut into 1/2-inch cubes, the rest grated
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For the sauce:
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1 3/4 cup beef broth
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1/4 cup red wine
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2 tablespoons cornstarch
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Kosher salt and freshly ground black pepper, to taste