MAKE THE DRESSING. In a small bowl, combine all the ingredients for the dressing and mix well. Use a whisk to remove lumps. Set aside.
PREPARE THE SALAD INGREDIENTS. Wash and cut the lettuce into bite-size pieces. Flake the imitation crab meat and smash the hard-boiled egg with a fork. If using cucumber, slice them into small pieces. If using corn kernels, cook them first (if from frozen) according to package instructions or drain the liquid (if using canned). Combine all the salad ingredients in a serving bowl.
SERVE. When ready to serve, pour the dressing over the salad and mix well.