In a large sauce pot, add potatoes and carrots. Add water to cover and bring to a boil. Cook until vegetables are tender. Drain and cool. In a blender, add the 1 egg, the vinegar, sugar, and salt. Cover and set at high speed. Immediately remove feeder cap and slowly add oil in a steady stream. Continue blending until thick; chill dressing. Before serving, combine potatoes, carrots, crab, and peas; add dressing and mix lightly. Arrange lettuce on a serving dish; add potato mixture. Top with eggs and olives. Makes 6 to 8 servings.