Prepare the Vegetables: Start by getting your cabbage and carrots ready. Using a sharp knife or a mandoline, finely shred the green cabbage until it forms delicate, thin ribbons. Do the same for the red cabbage if you're using it – you’ll see the vibrant colours begin to swirl together. Next, grate your carrots into fine strands. Place all the shredded vegetables into a large mixing bowl; they should look like a colourful, fluffy mound.

Whisk the Dressing Base: In a separate medium-sized bowl, combine the mayonnaise, apple cider vinegar, and granulated sugar. Use a whisk to thoroughly blend these ingredients. As you whisk, the mixture will start to become smooth and slightly pale, with the sugar dissolving into the creamy base.

Add Flavourings: Now, it's time to build the signature taste. Stir in the Dijon mustard, onion powder, and celery salt into the dressing mixture. Add a pinch of fine sea salt and a touch of freshly ground black pepper. Whisk again until everything is fully incorporated and the dressing smells subtly tangy and savoury. You’ll notice the dressing's colour is now a uniform, light creamy yellow.

Combine Dressing and Vegetables: Pour the prepared dressing over the shredded cabbage and carrots in the large mixing bowl. Using a large spoon or salad servers, gently toss the vegetables, ensuring every strand is coated. You should hear a soft rustling sound as the dressing begins to cling to the vegetables, transforming their dry appearance into a glistening, moist mix.

Chill for Flavour Development: Once thoroughly mixed, cover the bowl tightly with cling film or a lid. Transfer the coleslaw to the refrigerator to chill for at least 2 hours. This step is crucial; it allows the flavours to meld and deepen, and the vegetables to slightly soften while retaining their satisfying crunch. The salad will feel cool to the touch and the dressing will have thickened slightly.

Serve and Enjoy: Before serving, give the coleslaw another gentle stir. You'll notice the colours have brightened slightly, and the aroma is a wonderful balance of sweet and tangy. Spoon the coleslaw into a serving dish and present it alongside your favourite meals. Friends always ask me for this recipe after trying it at dinner parties, which I think is the highest compliment!