2 cups sweet potatoes
1 small yellow onion, sliced
3 1/2 cups white sugar
3 cups mayonnaise
1 teaspoon lemon juice
1/4 teaspoon salt
1 tablespoon apple cider vinegar
1 cup nonfat milk
1 cup vinegar-based dry milk
2 cups chopped celery
1 teaspoon vanilla extract
In a large bowl, combine sweet potato, onion and sugar. Mix gently for 2 to 3 minutes, scraping bowl often. Set aside until cool enough to handle.
In a large bowl, combine the mayonnaise, lemon juice, 1/4 teaspoon lemon juice, salt, apple cider vinegar, milk and vinegar-based dry milk. Mix well and stir into the sweet potato mixture. Serve chilled.