Finely chop the shredded cabbage and carrots. Set aside.
20 ounces finely shredded cabbage, 1/4 cup carrots
In a large mixing bowl, whisk together the vinegar, sugar, mustard powder, and salt until the sugar is dissolved.
4 teaspoons vinegar, 1/4 cup sugar, 1/4 teaspoon dried mustard, ¼ teaspoon salt
Whisk the mayonnaise into the vinegar mixture.
1 cup mayonnaise
Add the cabbage and carrots into the sauce and stir to combine.
Refrigerate for 2 hours until cold and serve.
Notes
You could stretch one batch out to 8 servings.They did not indicate what type of vinegar, however I would assume white distilled. Apple cider would also work but brings a little flavor with it.