1 (3 oz.) pkg. lime Jello
1 c. hot water
1 tbsp. vinegar
1/2 c. mayonnaise
1 lg. cucumber, unpeeled
1 tbsp. grated onion

Dissolve Jello in hot water. Let cool. Beat vinegar and mayonnaise together. Grate cucumber. When Jello is slightly thickened, add vinegar and mayonnaise mixture, cucumber and onion. Refrigerate.