Vegan Barbacoa Fajitas

Ingredients (for 4 servings)

• 1 cup — slivered red onion
• 0.33 cup — lime juice
• 0.12 tsp — sea salt
• 0.5 cup — vegetable broth
• 3 tbsp — cider vinegar
• 1 tbsp — tomato paste
• 2 tsp — canned chipotle pepper in adobo sauce
• 2 clove — garlic
• 1 tsp — cornstarch
• 1 tsp — cumin
• 0.5 tsp — oregano
• 4 whole — portobello mushrooms
• 1 whole — yellow bell pepper
• 1 whole — red bell pepper
• 12 whole — 6-inch corn tortillas
• 0 whole — Optional toppings shredded lettuce and/or pico de gallo