4.1 from 16 votes
Onion Gratin
My French style Onion Gratin bakes up in a cheesy sauce finished off with a crunchy herb crumb topping ~ it goes with everything!
Prep Time
20 mins
Cook Time
25 mins
Total Time
45 mins
Servings:
6
servings
Calories:
287 kcal
Course:
Side Dish
Cuisine:
French, American
Ingredients
- 2-3 red onion large, plural
- olive oil for brushing
- 2 Tbsp butter divided, unsalted
- 1 Tbsp all-purpose flour
- 2/3 cups heavy cream
- 3 Tbsp dry sherry
- salt fresh cracked
- black pepper fresh cracked
- nutmeg I grate mine fresh, dash
- thyme handful, fresh
- 1 cup gruyere cheese shredded
- 2/3 cup breadcrumbs
Instructions
- Preheat oven to 400F
- Peel and thickly slice the onions about 1/2" thick. If you cut them much thicker than that, you may have trouble getting them cooked through.
- Heat a grill pan until quite hot, and brush the onion slices lightly with olive oil. Grill the slices for a minute or two on each side so that they get slightly softened and have nice grill marks. Set them aside.
- In a saucepan, heat 1 Tbsp of the butter over medium heat, and stir in the flour. Cook for a minute, stirring constantly. Pour in the cream and sherry and whisk until smooth. Stir constantly while the mixture comes up to a simmer and is thickened. Add salt and pepper to taste and the dash of nutmeg.
- Pour the sauce into a cast iron skillet or gratin dish. Arrange the onion slices over the sauce.
- Sprinkle the cheese evenly over all.
- Stir the breadcrumbs together with the last tablespoon of melted butter, and a little salt, pepper, and a few thyme leaves. Sprinkle the breadcrumbs over the cheese,
- Bake for about 20-25 minutes until browned and bubbling. Check the onions with the tip of a sharp knife, they should feel tender. You can run the gratin under the broiler at the last minute if you want extra browning,
Cup of Yum
Notes
- *This recipe was first published in 2013, and was re-tested and rephotographed in 2024.
Nutrition Information
Calories
287kcal
(14%)
Carbohydrates
14g
(5%)
Protein
9g
(18%)
Fat
21g
(32%)
Saturated Fat
13g
(65%)
Polyunsaturated Fat
1g
(6%)
Monounsaturated Fat
6g
(30%)
Trans Fat
0.2g
(10%)
Cholesterol
64mg
(21%)
Sodium
254mg
(11%)
Potassium
128mg
(3%)
Fiber
1g
(4%)
Sugar
3g
(6%)
Vitamin A
715IU
(14%)
Vitamin C
3mg
(3%)
Calcium
272mg
(27%)
Iron
1mg
(6%)
Nutrition Facts
Serving: 6 servings
Amount Per Serving
Calories 287
% Daily Value*
| Calories | 287kcal | 14% |
| Carbohydrates | 14g | 5% |
| Protein | 9g | 18% |
| Fat | 21g | 32% |
| Saturated Fat | 13g | 65% |
| Polyunsaturated Fat | 1g | 6% |
| Monounsaturated Fat | 6g | 30% |
| Trans Fat | 0.2g | 10% |
| Cholesterol | 64mg | 21% |
| Sodium | 254mg | 11% |
| Potassium | 128mg | 3% |
| Fiber | 1g | 4% |
| Sugar | 3g | 6% |
| Vitamin A | 715IU | 14% |
| Vitamin C | 3mg | 3% |
| Calcium | 272mg | 27% |
| Iron | 1mg | 6% |
* Percent Daily Values are based on a 2,000 calorie diet.