Step 4
Using a spoon, scrape out the black “gills” from the undersides of the mushrooms. In a small bowl, combine the remaining 2 Tbs. oil with the vinegar. Brush both sides of the mushrooms with the oil-vinegar mixture and season with salt and pepper. Place the mushrooms, stem side down, over the hottest part of the file, cover the grill, and cook for 6 minutes. Remove the mushrooms from the grill. Divide the chickpea mixture among the mushroom caps, packing it down lightly. Return the mushrooms to the grill, filling side up. Cover and cook for 6 minutes more. For the last 3 minutes of grilling, place the rolls cut side down on the grill to warm.