I learned to make this by watching my mom, so I don't really have an exact recipe. But, this is my best guess:

1/2 green cabbage, shredded with "slicer" disk in food processor
1/2 cup mayonnaise
1/8 cup of sugar
2-3 Tbsp apple cider or red wine vinegar
1/2 tsp of horseradish (red or white, doesn't really matter)
Fresh-ground black pepper to taste
Optional: slivers of apples, raisins, or halved grapes - for a little extra sweet explosion

Mix all ingredients well. Adjust to taste. If too sweet, add more vinegar or horseradish; if too spicy/sour, add more sugar; if not creamy enough, add more mayo... you get the idea.

Eat.