Portobello and Zucchini Tacos

INGREDIENTS

• 5 medium portobello mushrooms, stems and gills removed, sliced 1/2 inch thick
• 2 teaspoons dried oregano
• 2 tablespoons olive oil
• Coarse salt and ground pepper
• 4 medium zucchini, cut into 2-by-1/2-inch sticks
• 1 medium red onion, halved and sliced 1/4-inch thick
• 12 (4 1/2-inch) corn tortillas
• 6 ounces (1 cup) Monterey Jack cheese, shredded
• 1/2 cup fresh salsa