In large bowl, combine cabbage and 2 teaspoons salt. Place plate over surface; weight down with canned goods. Let stand 60 minutes.
Stir sour cream, sugar, vinegar, remaining 1/2 teaspoon salt in bowl.
Squeeze cabbage by handfuls to remove extra liquid. Add with onion, carrot to sour cream mixture. Toss. Makes 10 servings.