1 cup mayonnaise
2 tablespoons fresh lemon juice
8 cups finely sliced Napa cabbage (about 1 head)
2 cups grape tomatoes
1 1/2 cups fresh lump crabmeat
3/4 cup chopped green onions
1 avocado, cubed
1 cup cashews
1/2 teaspoon kosher salt
1/2 teaspoon freshly ground black pepper
Combine mayonnaise and lemon juice, stirring well; cover and chill.
Gently toss together cabbage and remaining ingredients in a large bowl. Carefully toss in dressing. Serve immediately.