1 1/2 pound cabbage, cored and thinly sliced (6 cups)
2 1/2 teaspoons salt
2 tablespoons olive oil
3 tablespoons red-wine vinegar
1 1/2 tablespoons honey mustard
1/4 teaspoon black pepper
5 radishes, thinly sliced
Toss cabbage with salt in a large bowl and let stand, stirring occasionally, 20 minutes.
Meanwhile, whisk together oil, vinegar, honey mustard, and pepper in a small bowl until combined.
Rinse cabbage with cold water in a colander, then firmly squeeze handfuls to remove excess water and transfer cabbage to cleaned bowl. Add radishes and dressing to cabbage, tossing to combine.