Wipe mushrooms clean with a damp cloth. Remove stems and gills from mushrooms. Brush mushrooms lightly with olive oil. For a charcoal grill, grill mushrooms on the rack of an uncovered grill directly over medium coals for 5 minutes. Turn and grill 5 to 7 minutes more or until tender. (For a gas grill, preheat grill. Reduce heat to medium. Place mushrooms on grill rack over heat. Cover and grill as directed above.)
Meanwhile, in a small bowl, combine lemon juice, red wine vinegar, Dijon-style mustard, Worcestershire sauce, garlic, and pepper. Whisk in mayonnaise.
Slice grilled mushrooms. Toss lettuce with dressing in a very large bowl. Divide among serving plates. Top each with sliced mushrooms, croutons, and cheese.
The dressing for traditional Caesar salad has approximately 160 calories and 16 grams of fat in a 2-tablespoon serving. But the dressing in this Caesar salad, developed by Dr. Richard Collins, The Cooking Cardiologist, has just 17 calories and virtually no fat.