Americans love melted cheese: on burgers, nachos, pizza, sandwiches, in fondue and queso dips.
On the elegant end of the melted cheese menu is a gratin (grah-TAH, although Americans say GRAH-tin), a casserole that is topped with seasoned breadcrumbs and cheese, which is browned.
Potatoes au gratin is a popular rendition, but your favorite vegetables can be given the same treatment*. If family members won’t eat their broccoli, cauliflower, eggplant, green beans, spinach, etc.
Our mother was very fond of tomatoes au gratin, when she needed a tomato fix during the winter season. She also preferred onions au gratin to creamed onions for the melty cheese.
Both dishes use thinly-sliced potatoes, and people often use the terms interchangeably. We have seen this error in major online recipe databases, like All Recipes.
And even earlier cooks used what today would be incorrect terminology. Gratin Dauphinois, a French dish of sliced potatoes baked in cream, has no cheese or crumbs.
For today’s correct usage:
Gratin recipes originated in Europe, possibly in Provence, which once used the word gratoneya to a certain way of cooking foods (source).
Most people would think it originally came from the French word gratin, a derivative of the verb grater, to grate.
But in the 16th century, that word referred to what we today call the fond, the French word for bottom, indicating food which sticks to the bottom of the pot and has to be scraped (gratte) off to be eaten.
Since the 19th century the meaning has changed to indicate a crisply baked, browned top, and the term “au gratin” indicates a dish topped with grated cheese.
RECIPE: POTATOES AU GRATIN (POTATO GRATIN)
This recipe (photo #1), from the Idaho Potato Commission, builds on the original, adding bacon, garlic and scallions.
While gruyère is the classic recipe cheese, this variation uses a combination of gruyère and parmesan.
Cooks add their own touches. Here are some suggestions:
1. PREHEAT the oven to 350°F. Generously butter 9-inch-by-13-inch casserole dish.
2. SLICE a thin layer off the head of garlic and place the bulb on a piece of foil. Drizzle with olive oil and sprinkle with salt and pepper. Fold the foil into a pouch and place on a baking sheet. Bake for 35-40 minutes, or until the cloves are soft and tender. Allow the garlic to cool long enough to handle; then squeeze out the cloves and set aside.
 Potatoes au gratin. The recipe, from the Idaho Potato Commission, is below.
3. HEAT a large sauté pan over medium heat. Add the bacon and cook, stirring occasionally, until the bacon is crispy. Using a slotted spoon, transfer the bacon to a paper towel-lined plate; set aside.
4. ADD the butter, cream, and roasted garlic to a saucepan. Heat over medium-low heat until the butter is melted. Whisk the mixture to combine all of the ingredients and break up the roasted garlic cloves.
5. PLACE a layer of potato slices on the bottom of the prepared casserole dish. Pour a thin layer of the cream mixture over the top. Sprinkle with kosher salt and black pepper. (Season each layer as you build it, and lightly press down on the layers before adding the next one.)
6. TOP with approximately 2 teaspoons chives, 2 tablespoons scallions, 3 tablespoons bacon, and 2 tablespoons cheese. Repeat until all of the potatoes are used up. Top the final layer with the remaining cream, chives, scallions, bacon and cheese.
7. BAKE at 350°F uncovered for 1 hour and 15 minutes, or until the potatoes are cooked through and the top is crispy and golden brown. Serve immediately.
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