Ingredients

1/2 cup balsamic vinegar

2 teaspoons extra-virgin olive oil

3 tablespoons chopped fresh oregano

1/2 teaspoon red-pepper flakes

2 garlic cloves, finely chopped

1 medium red onion, cut into 1/4-inch rings

2 red bell peppers, quartered lengthwise

8 portobello mushroom caps, gills scraped out with a spoon

1 teaspoon coarse salt

1/2 teaspoon freshly ground pepper

3 ounces grated fontina cheese (1 cup)

4 slices rustic bread, halved diagonally

1 teaspoon extra-virgin olive oil

1/4 teaspoon coarse salt

1/4 teaspoon freshly ground pepper

5 ounces mixed salad greens

Preparation

Make the vegetables: Combine vinegar, oil, oregano, red-pepper flakes, and garlic. Pour over onion, peppers, and mushrooms on a rimmed baking sheet. Marinate at room temperature, turning occasionally, for 30 minutes.

Preheat grill to medium-high. Remove vegetables from marinade, and reserve marinade. Season vegetables with the salt and pepper; grill, turning and brushing occasionally with marinade, until tender, 5 to 6 minutes for onion, 10 to 12 minutes for peppers and mushrooms. Fill mushrooms with cheese; grill until cheese melts, about 30 seconds. Grill bread until toasted, about 30 seconds per side.

Make the salad: Whisk together oil, the salt and pepper, and 3 tablespoons reserved marinade; toss with greens. Serve with vegetables and bread.