Peel, wash and cut yellow yam into cubes.
Bring water to a boil in a sauce pot, add yam and salt and boil until fork tender.
Cut string beans into three or four pieces, peel and dice carrots, blanch vegetables.
Chop onions and peppers, add yam, vegetables, Grace Green Peas, Grace Mayonnaise and toss lightly.
Put the salad to chill in a refrigerator for about 30 minutes.
To Serve: Arrange on a bed of lettuce and then serve.