Preheat grill to medium high heat.

Brush cut sides of lettuce evenly with oil. Pkace lettuce, cut sides down, on a grill coated with cooking spray, and grill for 2 minutes. Remove from heat; cut each lettuce half lengthwise in half again to form 4 quarters. Sprinkle cut sides of lettuce with 1/4 tsp black pepper and 1/8 tsp salt.

Combine remaining 1/4 tsp pepper, remaining 1/4 tsp salt, mayonnaise and remaining ingredients in a small bowl, stirring well.

Place 1 lettuce quarter on each of 4 salad plates; drizzle each serving with about 4 tsp dressing.

Hands on Time: 16 minutes Total Time: 36 minutes