Root Vegetable Gratin recipes

Ingredients

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

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Recipe Notes 

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