Gratin is a dish that we used to think was too elegant for everyday meals…luckily, we’ve seen the light and now know just how wrong we were about that. Whether it’s a classic potato gratin, or one with cauliflower or spinach thrown in, you really can’t go wrong with it and we’re so glad we’re on board! This one is similar to the traditional potato version, but we added Vidalia onions that add a lot more flavor and go fantastically with the potato and creamy, cheesy sauce. If you can slice some veggies and whisk together a quick sauce, you can have one of the best gratins you’ve ever tasted!
Potato And Onion Gratin
- 2 pounds yukon gold potatoes (6-7 potatoes), peeled and thinly sliced
- 1 large white sweet onion, peeled and thinly sliced
- 2 cloves garlic, minced
- 1 cup heavy cream
- 1 cup whole milk
- 1/2 cup gruyere or cheddar cheese, grated
- 3 tablespoons unsalted butter
- 3 tablespoons all-purpose flour
- 1 tablespoon fresh rosemary, minced
- 1/2 tablespoon fresh thyme, minced
- 1/4 teaspoon ground nutmeg
- kosher salt and freshly ground pepper, to taste
- Preheat oven to 400º F.
- Make an overlapping layer of 1/2 of potato slices along the bottom of a 9×13-inch baking dish, then top with 1/2 of onions and garlic.
- Season generously salt and pepper, then repeat layers with remaining potatoes, onion and garlic.
- Heat butter in a large saucepan over medium heat. Stir in flour and cook, whisking continuously, until smooth and paste-like. About 2 minutes.
- Slowly stir in milk and heavy cream and cook for 5-10 minutes, or until thickened, then mix in 1/2 of gruyere and stir until melted and smooth.
- Add nutmeg and season with salt and pepper, then taste and adjust seasoning, if necessary.
- Pour sauce evenly over potatoes and onions and top with rosemary, thyme and remaining cheese.
- Place baking dish in oven and bake for 1 hour, or until potatoes are fork tender and surface is golden brown. (Cover with aluminum foil if cheese is melting and browning too quickly.)
- Remove from oven and serve hot.
Recipe adapted from Williams-Sonoma