1 1/2 tablespoons Dijon-style mustard plus additional for spreading on the bread
1 1/2 tablespoons drained bottled horseradish
1/4 cup olive oil
3 cups thinly sliced cabbage
1 cup thinly sliced red onion
1 cup coarsely grated carrots
a 16-inch-long loaf of Italian or French bread, halved horizontally with a serrated knife
1/2 pound thinly sliced corned beef
Directions
In a large bowl whisk together the vinegar, 1 1/2 tablespoons of the mustard, the horseradish, and salt and pepper to taste, add the oil in a stream, whisking, and whisk the dressing until it is emulsified. Add the cabbage, the onion, and the carrots, toss the coleslaw well, and chill it, covered, overnight.
Spread the bread with the additional mustard, arrange the coleslaw and the corned beef on the bottom half of the bread, and fit the top half on the filled bottom, pressing the loaf together firmly. Quarter the sandwich with a serrated knife and wrap it tightly in plastic wrap. (The sandwich may be made 6 hours in advance and kept wrapped and chilled).
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