root vegetable gratin

root vegetable gratin was pinched from <a href="https://smittenkitchen.com/2016/11/root-vegetable-gratin/" target="_blank" rel="noopener">smittenkitchen.com.</a>
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 and 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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