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Nutrition information coming soon.
PLACE mustard, basil, and 2 tablespoons of the Italian dressing in food processor. Cover. Process until smooth, scraping down sides as necessary. Set aside.
GRILL mushrooms, peppers, and onions over medium heat 8 to 10 minutes, turning occasionally and brushing mushrooms with remaining Italian dressing.
PLACE 1 portobello mushroom cap on each roll. Top with peppers and onions. Drizzle vegetables with Pesto before serving.