Expect a touch of smoky flavor in these vegetarian tacos, courtesy of the fire roasted corn and chipotle adobo sauce. That boldness in flavor is contrasted with creamy cotija cheese and sour cream, and brightness from fresh lime and cilantro. The “meat” is made with a hearty combination of walnuts and chopped mushrooms. For a twist on the recipe, serve the taco filling over a rice base instead of in tortillas.