Delicata Squash and Tomato Gratin (or Casserole)

September 16, 2017
4 Ratings
Photo by Vicky | Things I Made Today
  • Serves 6
Author Notes

Delicata squash and tomato gratin in a skillet with gruyere cheese. —Vicky | Things I Made Today

What You'll Need
  • 6 tablespoons butter, divided
  • 2 medium red onions, thinly sliced
  • 2 pounds delicata squash, cut in half lengthwise, seeds removed, then cut into 1/2 inch thick moons
  • 1 1/2 teaspoons salt, divided
  • 1 1/4 pounds tomatoes, sliced thin
  • 1/2 cup vegetable broth
  • 1/2 cup all purpose flour
  • 1 1/4 cups whole milk
  • 1 tablespoon Dijon mustard
  • 2 cups gruyere cheese, grated
  • 2 tablespoons flat-leaf parsley, chopped
  1. Preheat oven to 400F.
  2. In a heavy bottomed skillet, melt 4 tablespoons butter over medium heat. Add red onions and cook for about 2 minutes, until they start to soften. Add squash and ½ teaspoon salt. Cook until squash starts to brown, about 5 minutes. Pour in stock, bring to a simmer, reduce heat and cook for about 5 more minutes.
  3. Meanwhile, make the sauce. In a small saucepan, melt remaining 2 tablespoons of butter. Remove from heat and whisk in flour until a thick paste forms. Slowly add milk, whisking constantly. Return saucepan to heat and continue to whisk until mixture starts to thicken, about 3 minutes. Remove from heat and stir in 1 teaspoon salt, Dijon mustard, and half of the cheese.
  4. Transfer squash and onions to a 9 x 13 inch baking dish. Add tomatoes, tucking them all around the squash and between layers, so their evenly spread throughout the baking dish. Pour sauce on top and use a wooden spoon to mix throughout. Top gratin with remaining cheese and parsley.
  5. Bake for 15 minutes until squash is soft and cooked through. Turn broiler on high and finish under the broiler for 5 minutes, so cheese starts to brown. Let cool for 10 minutes before serving.

See what other Food52ers are saying.

  • PegBaltz
  • Judy Payne
    Judy Payne

2 Reviews

PegBaltz November 7, 2020
I was a little skeptical about how this would taste. I was very pleasantly surprised. I should have been a more patient with the final bake, it could have used more time. Also, there was no mention of peeling. The skin was a bit tough but added cooking may help that issue. I may try peeling next time. All in all, great flavors.
Judy P. October 17, 2019
Great! I followed it pretty closely and we LOVED it!