Lidia Bastianich’s Onion and Potato Gratin
Serves: 8
This is a classic, if slightly inelegant gratin.
And that’s what I love about it.
Thicker slices or potato and onion when compared to the far thinner slices of potato when we cook a French gratin.
The addition of the sage and bay leaves and the two types of cheese just adds to the comfort.
Nothing revolutionary here, though as a side, you’re just going to make people very happy.
Ingredients
2 tbsp unsalted butter plus more for the baking dish
2 large white onions, thickly sliced
Sea salt
8 large, fresh sage leaves
1 c heavy cream
1 c whole milk
2 fresh bay leaves
1 kg medium potatoes, peeled and sliced 1cm thick
170gm Italian Fontina, grated (I substituted Gruyère)
3/4 c freshly grated Grana Padano or Parmesan
Method
- Butter a large baking dish and set it aside. Preheat the oven to 200c.
- Melt the 2 tbsp butter in a medium pan over medium heat. When the butter is melted, add the onions, season with 1 tsp salt and cook, stirring occasionally, until the onions are wilted, about 10 minutes.
- Add the sage leaves, let them sizzle for a minute, then add the cream, milk and bay leaves. Bring to a simmer and season with 1 tsp salt. Add the potatoes, and simmer just to combine, 3 – 4 minutes.
- Add the cheeses to a medium bowl and toss to combine them. Transfer half of the potato-cream mixture to the baking dish and spread in an even layer. Sprinkle with half of the cheese mixture. Repeat with the remaining potatoes, then the cheese. Cover the baking dish with foil, and bake until it’s bubbly and the potatoes are tender, about 30 minutes. Uncover, and bake until the top is golden brown and crusty and the potatoes have absorbed the cream and are no longer soupy (it will thicken up more as it cools as well), about 30 minutes. Discard the sage and bay leaves. Let cool for 10 minutes before serving.

