Root Vegetable Gratin

Ingredients

• Good olive oil
• 1 1/2 cups sliced yellow onion (1 large)
• 2 cups (1/4-inch-sliced) fennel, top and core removed
• 1 tablespoon minced garlic (3 cloves)
• 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 potatoes, peeled and sliced 1/4 inch thick
• 2 1/4 cups heavy cream
• 1/2 cup chicken stock, preferably homemade
• 2 cups grated Gruyère cheese (6 ounces with rind)
• 2 teaspoons minced fresh thyme leaves
• Kosher salt and freshly ground black pepper
• 2 1/2 cups coarse fresh bread crumbs, crusts removed

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