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Ingredients
Extra-virgin olive oil
1 ½ pounds medium green zucchini, cut into ¾-inch cubes
Kosher salt and black pepper
1 ½ pounds yellow summer squash, cut into ¾-inch cubes
1 large onion, diced (about 1 ½ cups)
6 celery stalks, diced (about 1 cup)
Pinch of red-pepper flakes
1 tablespoon granulated sugar
3 tablespoons red- or white-wine vinegar
2 tablespoons medium capers, rinsed, soaked in cold water for 10 minutes and drained
24 green olives, such as Castelvetrano or Cerignola, for garnish
6 hard-boiled eggs (9-minute), for garnish
Italian parsley leaves, for garnish
Basil leaves, for garnish
12 (½-inch) slices Italian or French bread, toasted
Preparation
- Step 1
Pour ½ inch olive oil into a large, wide skillet over medium-high heat. When oil is hot, add enough zucchini to cover bottom of pan. Season lightly with salt and pepper. Let zucchini sizzle and brown slightly. Cook, stirring, until softened, about 5 minutes. Remove to a large bowl with a slotted spoon. Continue cooking zucchini and summer squash in batches, adding oil to the pan as necessary.
- Step 2
In the same skillet, cook the onions over medium-high heat, stirring, until softened, 5 to 7 minutes. Add celery and cook for 2 to 3 minutes more. Season with salt and pepper and transfer onion mixture to bowl with zucchini.
- Step 3
To the bowl, add red-pepper flakes, sugar, vinegar and capers. Toss gently together. Taste and adjust, making sure the seasoning is bright, with a balanced sweet-sour flavor. Leave for 10 to 15 minutes and taste again. (If time permits, let the flavors marry for an hour or more before serving. The caponata may be refrigerated for up to 2 days; bring to room temperature to serve.)
- Step 4
Transfer mixture to a large platter. Top with olives and hard-cooked eggs, halved or quartered. Garnish with parsley and basil leaves. Serve at room temperature with toasted bread for making crostini.
Private Notes
Comments
Every summer I cook up something similar...a pan of sweet onions, zucchini, gold bar squash, garlic sauteed in olive oil. Sometimes in slices, sometimes in a dice. With lots of dried basil and oregano. A splash of vinegar, hot pepper flakes. Eat it all week, hot, warm, room temp. May add pasta, mushrooms, chick peas, toasted walnuts, feta for a casserole. Even better if you let it sit for awhile. Oh, and I always cook the onions first to flavor the pan.
For years I have dreaded the annual arrival of squishy vegetable season. The unholy trinity of zucchini, summer squash, and eggplant. People would always say, "you just don't like it because you haven't had it pickled/fried/done by me/baked in a cake/sauteed in a twinkie". Even bacon did nothing to redeem it. But finally, this recipe has restored my faith in summer squash and the genius of chefs. This was fantastic. I will never again flee from zucchini.
not being fond of the flavor of cooked celery I substitute fresh fennel
I was all set to make this for a second time. I asked my husband to pick up the zucchini. When i was about to begin i discovered he had bought cucumbers instead! I switched out the zucchini for eggplant , leaving the black peel on.,and combined them with the summer squash and i added some julienned red pepper. It was very pretty! I ended up using the quantities from the eggplant carbonara recipe for the vinegar, wine, sugar, tomato paste etc. it was delicious!
Chopped up about a tablespoon of banana peppers that went well.
This is really delicious ! I already loved zucchini, in its more typical and subtle forms. But this tastes só bright and interesting, à nice change! I added a handful of golden raisins, to up the ‘sweet and salty’ factor.

