Grate your onion using a box grater until it becomes a juicy, almost liquid pulp-this releases maximum flavor into the brine. In a medium bowl, combine the grated onion, vegetable oil, white pepper, salt, sugar, white vinegar, and water. Whisk vigorously for 1-2 minutes until the sugar and salt completely dissolve. This brine is the foundation of your coleslaw’s distinctive taste.

Using a mandolin slicer (with the safety guard!), shred your cabbage as thin as humanly possible-think deli-counter thin, almost translucent. This paper-thin texture is crucial for authentic top of the river coleslaw. If using a knife, slice the cabbage quarters into the thinnest strips you can manage. Add the optional shredded carrots for visual appeal and subtle sweetness.

Transfer your shredded cabbage and carrots into a large bowl. Pour the prepared brine over the vegetables, then use tongs to toss thoroughly, ensuring every single strand gets coated. This step is critical-incomplete coverage means uneven flavor distribution. Cover the bowl tightly with plastic wrap or a fitted lid.

Refrigerate your brined cabbage for a minimum of 12 hours, ideally 24 hours. Before going to bed, give everything another good toss to redistribute the brine. During this resting period, the cabbage releases natural liquid while simultaneously absorbing the sweet-tangy brine. Don’t skip this overnight step-it’s what separates good coleslaw from extraordinary coleslaw.

After the brining period, drain your slaw in a colander, but reserve that precious liquid in a separate container. The cabbage will have softened and shrunk considerably. Return the drained slaw to your bowl and add ¾ cup of Hellmann’s mayonnaise. Mix gently but thoroughly until you achieve that signature creamy deli-style consistency. The mayo should coat without drowning the cabbage.

Before serving, taste your top of the river slaw and fine-tune the flavor. Need more tang? Add a tablespoon of the reserved brine. Want it creamier? Stir in another spoonful of mayonnaise. Craving more salt? A pinch goes a long way. This final adjustment ensures your coleslaw matches your personal preference perfectly.