Nigella Potato Gratin (Printable Version)
Layers of thinly sliced potatoes baked with cream, nigella seeds, and melted Gruyère for a rich, aromatic European-inspired side dish.
# What You'll Need:
→ Vegetables
01 - 2.5 pounds 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
# Step-by-Step:
01 - Preheat oven to 375°F. Grease a 9x13 inch baking dish evenly with butter.
02 - Arrange half of the sliced potatoes in the prepared dish, overlapping them slightly. Scatter half of the onions, half of the minced garlic, 1 teaspoon of nigella seeds, and half of the salt, pepper, and nutmeg over the potatoes.
03 - Layer the remaining potatoes and onions on top. Season with the remaining garlic, nigella seeds, salt, pepper, and nutmeg, distributing evenly.
04 - Whisk the heavy cream and whole milk together in a bowl, then pour the mixture evenly over the layered potatoes. Dot the surface with small pieces of the unsalted butter.
05 - Cover the dish tightly with aluminum foil and 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 to the oven uncovered and bake for an additional 20 minutes until the cheese is golden brown and the gratin is bubbling.
07 - Allow the gratin to rest for 10 minutes at room temperature before serving so the layers set and the cream stabilizes.
# Expert Advice:
01 -
- The nigella seeds add an almost oniony, subtly peppery depth that makes people guess what the secret ingredient is.
- It comes together with everyday ingredients but tastes like something from a restaurant kitchen.
02 -
- Slicing the potatoes unevenly was my biggest early mistake because thin pieces turn to paste while thick ones stay firm and the whole dish cooks unevenly.
- Infusing the milk with a bay leaf for ten minutes before mixing it with the cream adds a subtle herbal note that completely transforms the background flavor.
03 -
- Press down gently on the assembled gratin before baking so the potatoes compact and everything bakes in an even, cohesive layer.
- The nigella seeds release more flavor if you warm them in a dry pan for thirty seconds before scattering them through the dish.