Combine grated lemon zest, lemon juice, honey, salt and pepper in a small bowl. Add 2 Tbsp. hot water and mix well. Add mayonnaise and stir until smooth. (Dressing can be made up to 3 days in advance; cover and refrigerate.)
Arrange iceberg wedges on plates or a serving platter. Drizzle some dressing over each, sprinkle with pepper, if desired, and serve. Serve with remaining dressing.