Apple Potato And Onion Gratin Recipe

Ingredients for Apple Potato And Onion Gratin

• 12 tablespoons (1 ½ sticks) unsalted butter
• Onions
• Fresh Thyme
• Fine Sea Salt
• 2/3 cup water
• Dry White Wine
• 2 tablespoons brown sugar
• Yukon Gold Potatoes
• Tart Apples

How to Make Apple Potato And Onion Gratin

1. Preheat oven to 400°F (200°C).
2. Butter a 13x9 inch baking dish.
3. Melt 6 tablespoons of butter in a large nonstick skillet over medium heat.
4. Add 2 medium yellow onions (roughly chopped), 1 teaspoon fresh thyme leaves, and 2 teaspoons salt.
5. Sauté until onions are translucent, about 10 minutes.
6. Increase heat to medium-high.
7. Sauté until onions are tender and caramelized, about 8 more minutes.
8. Remove from heat.
9. Add 6 tablespoons butter, 2/3 cup water, 1/4 cup dry white wine (optional), and 2 tablespoons brown sugar to the skillet.
10. Stir to combine.
11. Bring to a boil, then remove from heat and let cool to lukewarm.
12. In a large bowl, combine 2 pounds Yukon Gold potatoes (thinly sliced), 2 medium apples (such as Honeycrisp or Fuji, peeled, cored and thinly sliced), remaining 2 teaspoons salt, and the cooled onion mixture.
13. Gently toss to coat.
14. Transfer the mixture to the prepared baking dish, spreading evenly.
15. Cover the dish with foil (optional: use parchment paper for easier clean up).
16. Bake until potatoes are tender, about 55 minutes.
17. Remove foil and bake until the top is golden brown and the juices bubble thickly, about 20 minutes more.
18. Let the gratin stand for 15 minutes before serving.