Sweet Potato and Caramelized Onion Gratin

TABLESPOON
12Ingredients
90Minutes

Ingredients

US|METRIC
  • 2 tablespoons butter
  • 3 onions (medium, cut into 1/4-inch slices)
  • 1 3/4 teaspoons salt
  • 1 tablespoon balsamic vinegar
  • 3 cups heavy whipping cream
  • 2 sprigs fresh thyme
  • 2 sprigs fresh sage
  • 2 cloves garlic (crushed)
  • 1/2 teaspoon ground black pepper
  • 2 1/2 pounds sweet potatoes (peeled, cut into 1/4-inch slices)
  • 1 pound yukon gold potatoes (peeled, cut into 1/4-inch slices)
  • 2/3 cup grated Parmesan cheese
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