Halve, seed and thinly slice 1 small acorn squash; cut 2 medium tomatoes into wedges. Toss the squash and tomatoes with 1 sliced small red onion, 2 smashed garlic cloves, 1 sprig rosemary, 2 tablespoons olive oil, 1 tablespoon balsamic vinegar, and salt and pepper. Roast at 425 degrees F, stirring once, until tender, 40 minutes. Toss with grated parmesan.
Photograph by Christopher Testani