Portobello Fajitas with Roasted Poblano Cream Sauce

Name: Portobello Fajitas with Roasted Poblano Cream Sauce
Ingredients: 1/2 cup cilantro leaves; 4 scallions, coarsely chopped; 3 garlic cloves; 4 tablespoons grapeseed or sunflower oil, divided; 3 tablespoons fresh lime juice; 2 tablespoons water; 1/2 teaspoon ground cumin; 4 large portobello mushroom caps, rinsed, patted dry, and cut into 1/2-inch slices; 2 red or green bell peppers, seeded, and cut into 1/2-inch slices; 1 medium onion, cut into 1/4-inch slices; Sea salt and fresh ground black pepper; 6 (7-inch) flour tortillas or 8 (5-inch) corn tortillas; Roasted Poblano Cream Sauce (recipe follows); 1 ripe Hass avocado, pitted, peeled, and cut into 1/8-inch slices