2 tablespoons rice vinegar |
2 tablespoons low-sodium soy sauce |
1 tablespoon brown sugar |
1 1/2 teaspoons dark sesame oil |
1/2 teaspoon ground ginger |
1/8 teaspoon ground red pepper |
cooking spray |
2 cups sliced shiitake mushroom caps |
4 medium green tomatoes, peeled and cut into 1/2-inch-thick wedges |
1 medium red onion, cut into 8 wedges |