Sweet potato and roots au gratin - www.scliving.coop

Ingredients

• 1 tablespoon unsalted butter
• 1½ cups heavy cream
• 2 large garlic cloves, smashed
• 3–4 sprigs fresh thyme
• 1 teaspoon kosher salt
• ½ teaspoon fresh ground black pepper
• 2 large, long sweet potatoes, peeled and thinly sliced
• 3 large parsnips, peeled and thinly sliced
• 3–4 beets, peeled and thinly sliced
• 1 cup grated Gruyere cheese