Molded Vegetable Salad

1 package lemon-flavored gelatin
2 cups boiling water
1/2 teaspoon salt
1 teaspoon grated onion
2 cups shredded tender, crisp cabbage
1/2 cup grated raw carrots
Lettuce
Mayonnaise

Dissolve gelatin in the boiling water; add salt, cool and chill. Meanwhile prepare vegetables. When gelatin is slightly congealed, fold in onion, cabbage and carrot. Pour into 3 or 4 cup mold or individual molds that have been rinsed with cold water and chill until firm. Unmold and serve on lettuce on individual salad plates. Serve with mayonnaise.