
6 10-inch wooden skewers
12 medium mushrooms
1 medium unpeeled eggplant, cubed
3 small zucchini, sliced 1⁄2 inch thick
3 small yellow squash, thinly sliced lengthwise
1 large red onion, cut into 1-inch chunks
1⁄3 cup olive oil
1½ teaspoons kosher salt
Freshly ground black pepper