Prepare coleslaw: whisk vinegar, Dijon, horseradish, salt, and pepper together in a large bowl. Continue to whisk while adding oil in a stream; whisk until dressing has emulsified.
Add cabbage, onion, and carrots to the dressing; toss until well combined. Cover and chill in the refrigerator, 8 hours to overnight.
Prepare sandwiches: spread each bread slice with mustard. Lay 5 slices on a work surface. Arrange coleslaw and corned beef over top, cover with remaining bread slices. Press together firmly, cut, and serve.
Nutritional Facts
Per 5 servings
Calories: 432
Carbohydrate: 41g
Fat: 19g
Fiber: 6g
Protein: 24g
Sugar: 6g
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