Ingredients
- 4 tbsp. unsalted butter
- 2 tbsp. olive oil
- 4 cloves garlic, finely chopped
- 1 medium red onion, thinly sliced
- 1⁄4 cup flour
- 2 cups milk
- 1 cup heavy cream
- 1 lb. russet potatoes, peeled and very thinly sliced
- 1 lb. rutabagas, peeled and very thinly sliced
- 1 tbsp. minced thyme leaves
- 2 cups (about 4 oz.) grated Gruyére cheese
- osher salt and freshly ground black pepper, to taste
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