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1
For the salad: Quarter and core the cabbage.
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2
Set up a food processor with the slicing blade.
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3
Slice the cabbage and then transfer it to a colander.
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4
Switch to the grating blade and shred the carrots; add to cabbage.
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5
Toss the cabbage and carrots with the salt and set colander in the sink until the vegetables wilt, 1 to 4 hours.
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6
Rinse cabbage mixture thoroughly in cold water and spin it dry in a salad spinner.
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7
Meanwhile, make the dressing: Whisk the vinegar with the honey, mustard, celery seeds, salt, and black pepper to taste in a small bowl.
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8
Gradually whisk in the olive oil, starting with a few drops and then adding the rest in a steady stream to make a smooth, slightly thick dressing.
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9
Quarter, core, and shred the apples.
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10
Toss the cabbage mixture with the apples, scallions, and about 12 cup of the dressing.
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11
Refrigerate until chilled and the flavors come together, about 1 hour.
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12
When ready to serve, toss the watercress with the remaining dressing.
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13
Make a ring on a platter with the watercress, and mound the coleslaw in the middle of the ring.
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14
Know-How: Salting the cabbage gives the slaw its characteristic tender bite, as well as expressing excess liquid.
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15
If you skip this step, your salad will be soggy and bland.