Sweet Potato and Caramelized Onion Gratin Recipe

Name: Sweet Potato and Caramelized Onion Gratin
Prep time: 45 min
Cook time: 45 min
Total time: 1 h 30 min
Yield: 10 servings
Ingredients: 2 tablespoons butter; 3 medium onions, 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 lb (1.13 kg) sweet potatoes, peeled, cut into 1/4-inch slices; 1 lb (500 g) Yukon Gold potatoes, peeled, cut into 1/4-inch slices; 2/3 cup grated Parmesan cheese

Ingredients

2 tablespoons butter
3 medium onions, 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 lb (1.13 kg) sweet potatoes, peeled, cut into 1/4-inch slices
1 lb (500 g) Yukon Gold potatoes, peeled, cut into 1/4-inch slices
2/3 cup grated Parmesan cheese

PREP TIME 45m	COOK TIME 45m	TOTAL TIME 1h30m
YIELD 10 servings

Instructions

Heat oven to 375°F. Spray 3-quart baking dish with cooking spray.
In 12-inch skillet, heat butter over medium-high heat. Add onions and salt; cook 15 to 20 minutes, stirring frequently, until onions are dark golden brown.
Add balsamic vinegar; cook and stir 1 to 2 minutes or until onions are dark brown.
In 5-quart Dutch oven, add whipping cream, thyme, sage, garlic and pepper. Heat to boiling over medium heat.
Remove from heat; let stand 10 minutes.
Remove thyme, sage and garlic. Return heat to medium; add sweet potatoes and Yukon Gold potatoes.
Cook and stir about 5 minutes or until potatoes are hot.
Spread one-third of the onions in baking dish. Layer half of the potato mixture, another one-third of the onions and 1/3 cup of the Parmesan cheese.
Repeat with remaining potato mixture and onions. Drizzle any remaining cream over onions, and sprinkle remaining 1/3 cup Parmesan cheese over top.
Cover with foil; bake 15 minutes. Remove foil; bake 25 to 30 minutes or until potatoes are tender and browned and bubbly.
Remove from oven; let stand 15 minutes before serving.