INGREDIENTS
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Olive oil
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1 large onion, sliced (1 1/2 cups)
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2 cups (1/4-inch-sliced) fennel, top and core, if thick, removed
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3 cloves garlic, minced (1 tablespoon)
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1 pound sweet potatoes, peeled and sliced 1/4-inch thick
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1 pound celery root, peeled and sliced 1/4-inch thick
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1 pound yukon gold, peeled and sliced 1/4-inch thick
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1 cup heavy cream (see Note up top)
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2 cups chicken or vegetable stock or brother
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2 cups grated gruyere cheese (6 ounces with rind)
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2 teaspoons minced fresh thyme leaves
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Kosher salt and freshly ground black pepper
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2 1/2 cups coarse fresh breadcrumbs or panko (what I used)
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2 to 3 tablespoons melted butter