Thaw snow crab and pat dry.
In large bowl, assemble green leaf lettuce, cucumber slices, tomatoes, red onion, green onion, avocado, hard boiled eggs, and snow crab meat.
To prepare the dressing, whisk together ketchup, mayonnaise, yellow onion, garlic, relish, horseradish and lemon juice in a medium bowl.
Serve salad with dressing.
Enjoy!