Nigella Potato Gratin (Printable)
Layers of thinly sliced potatoes baked with cream, aromatic nigella seeds, garlic, and melted Gruyère cheese create this luxurious European side dish.
# What You'll Need:
→ Vegetables
01 - 2.5 lbs starchy potatoes, peeled and thinly sliced
02 - 1 medium onion, finely sliced
→ Dairy & Cream
03 - 1 ½ cups heavy cream
04 - ¾ cup plus 1 tablespoon whole milk
05 - 1 cup grated Gruyère cheese
06 - 2 tablespoons unsalted butter
→ Spices & Aromatics
07 - 2 teaspoons nigella seeds
08 - 2 cloves garlic, minced
09 - ½ teaspoon ground nutmeg
10 - 1 teaspoon salt
11 - ½ teaspoon black pepper
# How-To Steps:
01 - Preheat the oven to 375°F. Grease a 9x13 inch baking dish generously with butter, ensuring all surfaces are coated to prevent sticking.
02 - Arrange half of the sliced potatoes in the prepared baking dish, overlapping them slightly in even rows. Scatter half of the sliced onions over the potatoes, then distribute half of the minced garlic, 1 teaspoon of nigella seeds, and half of the salt, pepper, and nutmeg evenly across the layer.
03 - Layer the remaining potatoes and onions over the first layer. Season with the remaining garlic, nigella seeds, salt, pepper, and nutmeg, distributing the spices uniformly for balanced flavor throughout.
04 - Whisk together the heavy cream and whole milk in a bowl until combined. Pour the mixture slowly and evenly over the layered potatoes, allowing it to seep down between the slices. Dot the surface with small pieces of the unsalted butter.
05 - Cover the baking dish tightly with aluminum foil and place in the center of the oven. Bake for 40 minutes until the potatoes are nearly tender when pierced with a knife.
06 - Remove the foil and sprinkle the grated Gruyère cheese evenly over the top. Return the dish to the oven uncovered and bake for an additional 20 minutes until the cheese is deeply golden and the cream is bubbling around the edges.
07 - Remove from the oven and allow the gratin to rest for 10 minutes before serving. This resting period lets the cream sauce thicken and set, making it easier to portion into clean slices.
# Expert Advice:
01 -
- The nigella seeds add a subtle warmth that makes people ask what your secret ingredient is.
- It comes together with humble ingredients but tastes like something from a restaurant kitchen.
02 -
- Slicing the potatoes unevenly will cause some pieces to turn to mush while others stay firm, so a mandoline slicer is genuinely worth using.
- Infusing the milk with a bay leaf for ten minutes before mixing it with the cream adds a layer of flavor that people will notice but never quite identify.
03 -
- Grate the Gruyere fresh from the block because pre grated cheese is coated in anti caking powder that prevents it from melting smoothly.
- Butter the baking dish while it is still slightly warm from washing and the coating will spread more evenly.