3medium zucchinior a combination of zucchini and yellow squash, about 1 1/4 pounds total
Salt
2-3tablespoonscanola oilor neutral oil with a high smoke point, such as avocado or grapeseed, or more if needed to coat the pan
For the Vierge Sauce
2medium vine-ripened tomatoes
2tablespoonsextra-virgin olive oil
2tablespoonsdiced Greek olivesor Spanish olives
1green onionchopped
2teaspoonsfresh lemon juice
1/2teaspoongrated fresh garlic
Salt and freshly ground black pepper to taste
Instructions
Preheat oven to 450 degrees.
Halve the zucchini lengthwise and score the flesh in a crosshatch pattern, about 1/8-inch deep.
Sprinkle the scored side of the zucchini with salt (Chef Keller recommends sprinkling the salt like “rain” or “snow” so it covers the flesh evenly). Let stand for 15 minutes to allow the salt to pull moisture from the flesh; this technique ensures that the zucchini stays firm during roasting.
Meanwhile, make the vierge sauce: Halve the tomatoes crosswise and use a small spoon to scoop out (and discard) the watery insides and seeds. Finely dice the tomatoes and transfer them to a medium bowl. Add the olive oil, olives, green onion, lemon juice, and garlic and toss to combine. Season with salt and black pepper.
Pat the zucchini dry and remove excess salt.
Heat the canola oil in a large, ovenproof skillet over medium-high heat (the oil should cover the surface of the pan by about 1/8-inch). When the oil is shimmering (but not yet smoking), add the zucchini, flesh side down. Sear until nicely browned and caramelized, but not burned, checking frequently. This should take about 5 minutes.
Transfer the pan to a lower oven rack and cook for 15 to 20 minutes, until the zucchini are very soft (timing will depend on the size of the zucchini and how deeply they were caramelized; check after 15 minutes – if the zucchini are soft to the touch, they’re ready).
Transfer the zucchini to serving platter and, if necessary and desired, blot with paper towels to remove excess oil.
Top the zucchini with some of the vierge sauce and serve with extra sauce on the side.