Use Up Summer's Bounty in This Colorful, Zucchini, Eggplant, Tomato Gratin Recipe (2024)

• 3 tablespoons extra virgin olive oil, divided

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• 2 cups sliced yellow onion (about 1 large onion)

• 1 cup sliced red, orange, or yellow bell peppers

• 1 eggplant, about 1/2 pound (a slender eggplant like a Japanese eggplant, not a large globe)

• 1 large zucchini or other summer squash, about 1/2 pound

• 2 medium tomatoes

• 3 cloves garlic, peeled and smashed

• 1 1/2 teaspoons salt

• 2 tablespoons chopped fresh parsley

• 2 ounces provolone cheese, sliced or grated

• 3 tablespoons grated Parmesan cheese

1. Preheat the oven:

   Preheat the oven to 350°F. Place the oven rack in the center position.

2. Sauté the onions and peppers:

   In a large sauté pan heat 2 tablespoons of the olive oil on medium high heat. Add the sliced onions and cook until lightly browned, stirring frequently, about 10 minutes.

   Add the sliced bell peppers and continue to cook with the onions until the bell peppers are softened and the onions are well browned, about 5 to 6 minutes more.

   

   

   When done, transfer the onions and bell peppers into a large gratin pan or casserole dish.

3. Slice the eggplant, zucchini, and tomato:

   While the onions and peppers are cooking, slice the eggplant and zucchini in 1/4-inch thick round slices.

   You'll also want to slice the tomato into 1/4-inch thick slices, but depending on how big your tomato is, you may need to cut the tomato in half or in quarters first.

   All of the sliced vegetable pieces should be about the same size to make it easier to layer them in an attractive manner.

4. Layer the sliced vegetables, add the garlic:

   Spread the cooked onions and bell peppers in an even layer at the bottom of the gratin dish. Place the mashed garlic on top of the onions and peppers.

   Arrange the slices of the eggplant, zucchini, and tomato on top of the cooked onions and peppers, alternating the vegetables, in an attractive pattern, stacking and fanning them across the surface of the dish.

   

   

5. Top with salt, parsley, cheeses, and olive oil:

   Sprinkle with salt and parsley. Top with provolone and Parmesan cheeses.

   Drizzle the remaining tablespoon of olive oil around the perimeter, where the vegetables meet the side of the dish.

   

6. Bake, then broil to finish:

   Cover with foil (it helps to grease the underside of the foil with a little olive oil so that the cheese as it melts does not stick to the foil).

   Bake for 40 minutes. Remove the foil. Turn on the broiler and broil for 5 minutes or until nicely browned.

Nutrition information is calculated using an ingredient database and should be considered an estimate. In cases where multiple ingredient alternatives are given, the first listed is calculated for nutrition. Garnishes and optional ingredients are not included.