Summer Vegetable Gratin

Summer Vegetable Gratin Recipe

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Candi Morgan


The most delicious side dish I make. The most time consuming too. but, so worth it.

★★★★★ 1 vote


6 Tbsp
extra-virgin olive oil
1 lb
zucchini, sliced 1/4-inch-thick slices
1 lb
summer squash (yellow), sliced crosswise into 1/4-inch-thick slices
2 tsp
1 1/2 lb
ripe tomatoes, sliced 1/4 inch thick
medium onions, halved lengthwise and sliced thin pole to pole
3/4 tsp
freshly ground pepper
cloves garlic
1 tsp
thyme, dried
1 c
bread crumbs, seasoned
2 tsp
fresh basil
shallots minced

How to Make Summer Vegetable Gratin


  • 1Adjust oven rack to upper-middle position and heat oven to 400 degrees
  • 2Brush 13- by 9-inch baking dish with 1 tablespoon oil; set aside.
  • 3Toss zucchini and summer squash slices with 1 teaspoon salt in large bowl
  • 4Let stand until zucchini and squash release at least 3 tablespoons of liquid, about 45 minutes.
  • 5Arrange slices on triple layer paper towels; cover with another triple layer paper towels.
  • 6Firmly press each slice to remove as much liquid as possible.
  • 7sprinkle evenly with 1/2 teaspoon salt
  • 8Place second double layer paper towels on top of tomatoes and press firmly to dry tomatoes.
  • 9Add onions, remaining 1/2 teaspoon salt, and 1/4 teaspoon pepper cook, stirring occasionally, until onions are softened and dark golden brown, 20 to 25 minutes.
  • 10Combine garlic, 3 tablespoons oil, remaining 1/2 teaspoon pepper, and thyme in small bowl.
  • 11arrange in greased baking dish.
  • 12arrange in greased baking dish.
  • 13Bake until vegetables are tender and tomatoes are starting to brown on edges, 40 to 45 minutes.
  • 14Combine bread crumbs, basil, , remaining tablespoon oil, Parmesan, and shallots in medium bowl.
  • 15Remove baking dish from oven and increase heat to 450 degrees. Sprinkle bread-crumb mixture evenly on top of tomatoes.
  • 16Bake gratin until bubbling and cheese is lightly browned, 5 to 10 minutes.

Printable Recipe Card

About Summer Vegetable Gratin

Course/Dish: Vegetables
Dietary Needs: Vegetarian
Other Tag: Healthy