Rinse the lettuce thoroughly and cut down the center, lengthwise. Generously baste both sides of the lettuce with the avocado or olive oil. Sprinkle the lettuce with the seasoning.
Heat your grill to medium-high heat. Place the lettuce, cut side down on the grill. Give the lettuce a slight mash with a spatula and grill until the lettuce begins to wilt slightly and char. Flip over and grill the same.
Sprinkle the top with lemon juice and the parmesan cheese.
Remove from the grill and top with bacon bits and dressing. Serve warm.