Make Ahead

French Onion Soup Lasagna

February 24, 2015
4 Ratings
Photo by Leith Devine
  • Serves 8
Author Notes

My husband and I had this dish in Rome and it was the best lasagna we've ever had. It really tastes like French Onion Soup. I was determined to create it at home! I added the breadcrumbs for some crunch at the end. —Leith Devine

What You'll Need
  • 6 fresh sheets of lasagna noodles
  • 3 cups carmelized onions
  • 1 pound sliced yellow onions
  • 2 tablespoons olive oil
  • 1-2 teaspoons browning sauce (optional)
  • 1 quart bechamel sauce
  • 6 tablespoons butter
  • 1/4 cup flour
  • 1 quart milk
  • 1 garlic clove, crushed
  • 1 pinch nutmeg
  • 2 cups gruyere cheese, grated
  • 2 cups ricotta cheese
  • 1 egg
  • 1/2 cup parmesan cheese
  • 1 bunch fresh thyme
  • 1 cup fresh italian breadcrumbs
  • 1 tablespoon parsley
  • Salt
  • white pepper
  1. To make carmelized onions: Slice onions, then add to oil in a large frying pan. Cook on medium heat, adding water to deglaze the pan. Cook down until browned and sticky. Keep stirring the onions to prevent burning. Add salt, pepper and and pinch of thyme to taste. This is not a speedy process, but so worth it ! Set aside when completed. Cheater onions: Cook onions as above, but add 1-2 tsps of gravy browning sauce to speed up the process!
  2. To make bechamel sauce: Melt the butter, then add the flour to make a roux. Whisk constantly on low heat to cook the flour but not brown the roux. Turn the heat up to medium and add the milk in a thin stream, whisking constantly to prevent lumps. Cook the sauce until thickened, approximately 10 minutes. Add 1 cup grated Gruyere cheese and salt and white pepper to taste. If you see lumps, strain the white sauce before adding the cheese.
  3. If desired, add crushed garlic clove to bechamel as it cooks. Remove it before adding the gruyere cheese. The crushed clove will add a mild garlic flavor.
  4. Mix the ricotta cheese with one egg and salt and pepper to taste. Set aside.
  5. Begin with a buttered baking dish. Place down a fresh lasagna sheet, then a thin layer of ricotta, then a thin layer of carmelized onions. Then add a thin layer of bechamel and sprinkle lightly with gruyere cheese. Repeat until casserole dish is almost full.
  6. Put a layer of bechamel last. Mix parmesan cheese with bread crumbs and sprinkle on top.
  7. Bake at 400 degrees for approximately 1/2 hour or until browned and bubbly. Let sit for 15 minutes before cutting so lasagna can firm up.

See what other Food52ers are saying.

  • Jay Burnett
    Jay Burnett
  • Leith Devine
    Leith Devine
  • Tracy Hursh
    Tracy Hursh

5 Reviews

Tracy H. December 13, 2022
I didn't read the reviews before making this - the first review is from the author of the recipe and identifies a missed ingredient. I made the recipe without the dry sherry and my wife and I loved it. But now I want to make it again, this time with the dry sherry. There is a typo in the ingredient list that says "1 bunch thyme", that should be "1 bunch arugula". It wasn't mentioned in the instructions, so that didn't get added. I think adding the arugula would cut the richness of the dish somewhat. I also used 3 3/4 pounds of yellow onions to achieve the 3 cups of caramelized onions needed for the recipe. I will definitely be making notes and trying again.
Jay B. March 3, 2015
Good idea. Actually cuts best when cooked and cooled, so that would be the thing to do. We've always enjoyed an onion panade as a side to Rib Roast. This would make a nice change. Thanks.
Jay B. March 2, 2015
I wonder how you could make this in individual portions to be used as a side dish for beef ?
Leith D. March 2, 2015
I'd get small oven safe dishes (like souffle or mini-casserole) and cut the lasagna sheets up to fit. Then layer them the same way. It's a great idea because this lasagna is rich and small portions may be perfect.
Leith D. February 26, 2015
Sorry I left out an ingredient in the recipe. The directions should call for deglazing the onions with sherry. In the bechamel, the directions should say 1 quart of milk less 1/2 cup, and 1/2 cup dry sherry to be added to the butter/flour/milk.. I was finishing the recipe and realized too late I hadn't typed it in! It's really delicious btw. Also, if you forget to add the arugula, it makes a great side salad :)