If you don't love blue cheese, use goat cheese (chèvre) or feta cheese for an equally delicious, tangy flavor. Gills are the brownish-black walls on the underside of mushroom caps. Scrape them off gently using a spoon. Removing gills keeps other ingredients from turning a grayish brown.
Southern Living MARCH 2005
Scrape gills from mushroom caps, if desired.
Combine 3 tablespoons vinegar, oil, and next 3 ingredients in a shallow dish or large zip-top plastic freezer bag; add mushrooms, turning to coat. Cover or seal, and chill 1 hour, turning occasionally. Remove mushrooms from marinade, discarding marinade.
Grill mushrooms, covered with grill lid, over medium-high heat (350° to 400°) 3 to 4 minutes on each side or until tender. Remove mushrooms from grill, and immediately sprinkle undersides evenly with blue cheese.
Stir together mayonnaise and 1 teaspoon vinegar. Spread mixture evenly on cut sides of buns; place lettuce, mushrooms, and tomato slices on bottom halves of buns, and cover with tops. Serve immediately.
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